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3D printing is any of various processes in which material is joined or solidified under computer control to create a three-dimensional object, with material being added together (such as liquid molecules or powder grains being fused together), typically layer by layer. In the '90s, 3D printing techniques were considered suitable only to the production of functional or aesthetical prototypes and, back then, a more comprehensive term for 3D printing was rapid prototyping. Today, the precision, repeatability and material range have increased to the point that 3D printing is considered as an industrial production technology, with the name of additive manufacturing. 3D printed objects can have a very complex shape or geometry and are always produced starting from a digital 3D model or a CAD file. There are many different 3D printing processes, that can be grouped into seven categories:
- Vat photopolymerization
- Material jetting
- Binder jetting
- Powder bed fusion
- Material extrusion
- Directed energy deposition
- Sheet lamination
The most common by number of users is a material extrusion technique called fused deposition modeling (FDM). This builds a three-dimensional object from a computer-aided design (CAD) model, usually by successively adding material layer by layer, unlike the conventional machining process, where material is removed from a stock item.
The term "3D printing" originally referred to a process that deposits a binder material onto a powder bed with inkjet printer heads layer by layer. More recently, the term is being used in popular vernacular to encompass a wider variety of additive manufacturing techniques. United States and global technical standards use the official term additive manufacturing for this broader sense.
- 1 Terminology
- 2 History
- 3 General principles
- 4 Processes and printers
- 5 Applications
- 6 Legal aspects
- 7 Health and safety
- 8 Impact
- 9 See also
- 10 References
- 11 Further reading
- 12 External links
The umbrella term additive manufacturing (AM) gained wide currency in the 2000s, inspired by the theme of material being added together (in any of various ways). In contrast, the term subtractive manufacturing appeared as a retronym for the large family of machining processes with material removal as their common theme. The term 3D printing still referred only to the polymer technologies in most minds, and the term AM was likelier to be used in metalworking and end use part production contexts than among polymer, inkjet, or stereolithography enthusiasts.
By the early 2010s, the terms 3D printing and additive manufacturing evolved senses in which they were alternate umbrella terms for additive technologies, one being used in popular vernacular by consumer-maker communities and the media, and the other used more formally by industrial end-use part producers, machine manufacturers, and global technical standards organizations. Until recently, the term 3D printing has been associated with machines low-end in price or in capability. Both terms reflect that the technologies share the theme of material addition or joining throughout a 3D work envelope under automated control. Peter Zelinski, the editor-in-chief of Additive Manufacturing magazine, pointed out in 2017 that the terms are still often synonymous in casual usage but that some manufacturing industry experts are increasingly making a sense distinction whereby Additive Manufacturing comprises 3D printing plus other technologies or other aspects of a manufacturing process.
Other terms that have been used as synonyms or hypernyms have included desktop manufacturing, rapid manufacturing (as the logical production-level successor to rapid prototyping), and on-demand manufacturing (which echoes on-demand printing in the 2D sense of printing). That such application of the adjectives rapid and on-demand to the noun manufacturing was novel in the 2000s reveals the prevailing mental model of the long industrial era in which almost all production manufacturing involved long lead times for laborious tooling development. Today, the term subtractive has not replaced the term machining, instead complementing it when a term that covers any removal method is needed. Agile tooling is the use of modular means to design tooling that is produced by additive manufacturing or 3D printing methods to enable quick prototyping and responses to tooling and fixture needs. Agile tooling uses a cost effective and high quality method to quickly respond to customer and market needs, and it can be used in hydro-forming, stamping, injection molding and other manufacturing processes.
1981 : Early additive manufacturing equipment and materials were developed in the 1980s. In 1981, Hideo Kodama of Nagoya Municipal Industrial Research Institute invented two additive methods for fabricating three-dimensional plastic models with photo-hardening thermoset polymer, where the UV exposure area is controlled by a mask pattern or a scanning fiber transmitter.
1984 : On 16 July 1984, Alain Le Méhauté, Olivier de Witte, and Jean Claude André filed their patent for the stereolithography process. The application of the French inventors was abandoned by the French General Electric Company (now Alcatel-Alsthom) and CILAS (The Laser Consortium). The claimed reason was "for lack of business perspective".
Three weeks later in 1984, Chuck Hull of 3D Systems Corporation filed his own patent for a stereolithography fabrication system, in which layers are added by curing photopolymers with ultraviolet light lasers. Hull defined the process as a "system for generating three-dimensional objects by creating a cross-sectional pattern of the object to be formed,". Hull's contribution was the STL (Stereolithography) file format and the digital slicing and infill strategies common to many processes today.
1988: The technology used by most 3D printers to date—especially hobbyist and consumer-oriented models—is fused deposition modeling, a special application of plastic extrusion, developed in 1988 by S. Scott Crump and commercialized by his company Stratasys, which marketed its first FDM machine in 1992.
AM processes for metal sintering or melting (such as selective laser sintering, direct metal laser sintering, and selective laser melting) usually went by their own individual names in the 1980s and 1990s. At the time, all metalworking was done by processes that we now call non-additive (casting, fabrication, stamping, and machining); although plenty of automation was applied to those technologies (such as by robot welding and CNC), the idea of a tool or head moving through a 3D work envelope transforming a mass of raw material into a desired shape with a toolpath was associated in metalworking only with processes that removed metal (rather than adding it), such as CNC milling, CNC EDM, and many others. But the automated techniques that added metal, which would later be called additive manufacturing, were beginning to challenge that assumption. By the mid-1990s, new techniques for material deposition were developed at Stanford and Carnegie Mellon University, including microcasting and sprayed materials. Sacrificial and support materials had also become more common, enabling new object geometries.
1993 : The term 3D printing originally referred to a powder bed process employing standard and custom inkjet print heads, developed at MIT in 1993 and commercialized by Soligen Technologies, Extrude Hone Corporation, and Z Corporation.
The year 1993 also saw the start of a company called Solidscape, introducing a high-precision polymer jet fabrication system with soluble support structures, (categorized as a "dot-on-dot" technique).
2009: Fused Deposition Modeling (FDM) printing process patents expired in 2009.
As the various additive processes matured, it became clear that soon metal removal would no longer be the only metalworking process done through a tool or head moving through a 3D work envelope transforming a mass of raw material into a desired shape layer by layer. The 2010s were the first decade in which metal end use parts such as engine brackets and large nuts would be grown (either before or instead of machining) in job production rather than obligately being machined from bar stock or plate. It is still the case that casting, fabrication, stamping, and machining are more prevalent than additive manufacturing in metalworking, but AM is now beginning to make significant inroads, and with the advantages of design for additive manufacturing, it is clear to engineers that much more is to come.
2012: Filabot develops a system for closing the loop with plastic and allows for any FDM or FFF 3D printer to be able to print with a wider range of plastics.
2018: re:3D develops a system that uses plastic pellets that can be made by grinding up waste plastic.
3D printable models may be created with a computer-aided design (CAD) package, via a 3D scanner, or by a plain digital camera and photogrammetry software. 3D printed models created with CAD result in reduced errors and can be corrected before printing, allowing verification in the design of the object before it is printed. The manual modeling process of preparing geometric data for 3D computer graphics is similar to plastic arts such as sculpting. 3D scanning is a process of collecting digital data on the shape and appearance of a real object, creating a digital model based on it.
CAD models can be saved in the stereolithography file format (STL), a de facto CAD file format for additive manufacturing that stores data based on triangulations of CAD models. STL is not tailored for additive manufacturing because it generates large file sizes of topology optimized parts and lattice structures due to the large number of surfaces involved. A newer CAD file format, the Additive Manufacturing File format (AMF) was introduced in 2011 to solve this problem. It stores information using curved triangulations. 
- faces normals;
- noise shells;
- manifold errors.
A step in the STL generation known as "repair" fixes such problems in the original model. Generally STLs that have been produced from a model obtained through 3D scanning often have more of these errors. This is due to how 3D scanning works-as it is often by point to point acquisition, 3D reconstruction will include errors in most cases.
Once completed, the STL file needs to be processed by a piece of software called a "slicer," which converts the model into a series of thin layers and produces a G-code file containing instructions tailored to a specific type of 3D printer (FDM printers). This G-code file can then be printed with 3D printing client software (which loads the G-code, and uses it to instruct the 3D printer during the 3D printing process).
Printer resolution describes layer thickness and X–Y resolution in dots per inch (dpi) or micrometers (µm). Typical layer thickness is around 100 μm (250 DPI), although some machines can print layers as thin as 16 μm (1,600 DPI). X–Y resolution is comparable to that of laser printers. The particles (3D dots) are around 50 to 100 μm (510 to 250 DPI) in diameter. For that printer resolution, specifying a mesh resolution of 0.01–0.03 mm and a chord length ≤ 0.016 mm generate an optimal STL output file for a given model input file. Specifying higher resolution results in larger files without increase in print quality.
Construction of a model with contemporary methods can take anywhere from several hours to several days, depending on the method used and the size and complexity of the model. Additive systems can typically reduce this time to a few hours, although it varies widely depending on the type of machine used and the size and number of models being produced simultaneously.
Traditional techniques like injection moulding can be less expensive for manufacturing polymer products in high quantities, but additive manufacturing can be faster, more flexible and less expensive when producing relatively small quantities of parts. 3D printers give designers and concept development teams the ability to produce parts and concept models using a desktop size printer.
Though the printer-produced resolution is sufficient for many applications, greater accuracy can be achieved by printing a slightly oversized version of the desired object in standard resolution and then removing material using a higher-resolution subtractive process.
The layered structure of all Additive Manufacturing processes leads inevitably to a strain-stepping effect on part surfaces which are curved or tilted in respect to the building platform. The effects strongly depend on the orientation of a part surface inside the building process.
Some additive manufacturing techniques are capable of using multiple materials in the course of constructing parts. These techniques are able to print in multiple colors and color combinations simultaneously, and would not necessarily require painting.
Some printing techniques require internal supports to be built for overhanging features during construction. These supports must be mechanically removed or dissolved upon completion of the print.
All of the commercialized metal 3D printers involve cutting the metal component off the metal substrate after deposition. A new process for the GMAW 3D printing allows for substrate surface modifications to remove aluminum or steel.
Processes and printers
A large number of additive processes are available. The main differences between processes are in the way layers are deposited to create parts and in the materials that are used. Each method has its own advantages and drawbacks, which is why some companies offer a choice of powder and polymer for the material used to build the object. Others sometimes use standard, off-the-shelf business paper as the build material to produce a durable prototype. The main considerations in choosing a machine are generally speed, costs of the 3D printer, of the printed prototype, choice and cost of the materials, and color capabilities. Printers that work directly with metals are generally expensive. However less expensive printers can be used to make a mold, which is then used to make metal parts.
ISO/ASTM52900-15 defines seven categories of Additive Manufacturing (AM) processes within its meaning: binder jetting, directed energy deposition, material extrusion, material jetting, powder bed fusion, sheet lamination, and vat photopolymerization.
Some methods melt or soften the material to produce the layers. In Fused filament fabrication, also known as Fused deposition modeling (FDM), the model or part is produced by extruding small beads or streams of material which harden immediately to form layers. A filament of thermoplastic, metal wire, or other material is fed into an extrusion nozzle head (3D printer extruder), which heats the material and turns the flow on and off. FDM is somewhat restricted in the variation of shapes that may be fabricated. Another technique fuses parts of the layer and then moves upward in the working area, adding another layer of granules and repeating the process until the piece has built up. This process uses the unfused media to support overhangs and thin walls in the part being produced, which reduces the need for temporary auxiliary supports for the piece. Recently, FFF/FDM has expanded to 3-D print directly from pellets to avoid the conversion to filament. This process is called fused particle fabrication (FPF) (or fused granular fabrication (FGF) and has the potential to use more recycled materials.
Laser sintering techniques include selective laser sintering, with both metals and polymers, and direct metal laser sintering. Selective laser melting does not use sintering for the fusion of powder granules but will completely melt the powder using a high-energy laser to create fully dense materials in a layer-wise method that has mechanical properties similar to those of conventional manufactured metals. Electron beam melting is a similar type of additive manufacturing technology for metal parts (e.g. titanium alloys). EBM manufactures parts by melting metal powder layer by layer with an electron beam in a high vacuum. Another method consists of an inkjet 3D printing system, which creates the model one layer at a time by spreading a layer of powder (plaster, or resins) and printing a binder in the cross-section of the part using an inkjet-like process. With laminated object manufacturing, thin layers are cut to shape and joined together.
Other methods cure liquid materials using different sophisticated technologies, such as stereolithography. Photopolymerization is primarily used in stereolithography to produce a solid part from a liquid. Inkjet printer systems like the Objet PolyJet system spray photopolymer materials onto a build tray in ultra-thin layers (between 16 and 30 µm) until the part is completed. Each photopolymer layer is cured with UV light after it is jetted, producing fully cured models that can be handled and used immediately, without post-curing. Ultra-small features can be made with the 3D micro-fabrication technique used in multiphoton photopolymerisation. Due to the nonlinear nature of photo excitation, the gel is cured to a solid only in the places where the laser was focused while the remaining gel is then washed away. Feature sizes of under 100 nm are easily produced, as well as complex structures with moving and interlocked parts. Yet another approach uses a synthetic resin that is solidified using LEDs.
In Mask-image-projection-based stereolithography, a 3D digital model is sliced by a set of horizontal planes. Each slice is converted into a two-dimensional mask image. The mask image is then projected onto a photocurable liquid resin surface and light is projected onto the resin to cure it in the shape of the layer. Continuous liquid interface production begins with a pool of liquid photopolymer resin. Part of the pool bottom is transparent to ultraviolet light (the "window"), which causes the resin to solidify. The object rises slowly enough to allow resin to flow under and maintain contact with the bottom of the object. In powder-fed directed-energy deposition, a high-power laser is used to melt metal powder supplied to the focus of the laser beam. The powder fed directed energy process is similar to Selective Laser Sintering, but the metal powder is applied only where material is being added to the part at that moment.
As of December 2017, additive manufacturing systems were on the market that ranged from $99 to $500,000 in price and were employed in industries including aerospace, architecture, automotive, defense, and medical replacements, among many others. For example, General Electric uses the high-end model to build parts for turbines. Many of these systems are used for rapid prototyping, before mass production methods are employed. Higher education has proven to be a major buyer of desktop and professional 3D printers which industry experts generally view as a positive indicator. Libraries around the world have also become locations to house smaller 3D printers for educational and community access. Several projects and companies are making efforts to develop affordable 3D printers for home desktop use. Much of this work has been driven by and targeted at DIY/Maker/enthusiast/early adopter communities, with additional ties to the academic and hacker communities.
In the current scenario, 3D printing or Additive Manufacturing has been used in manufacturing, medical, industry and sociocultural sectors which facilitate 3D printing or Additive Manufacturing to become successful commercial technology. The earliest application of additive manufacturing was on the toolroom end of the manufacturing spectrum. For example, rapid prototyping was one of the earliest additive variants, and its mission was to reduce the lead time and cost of developing prototypes of new parts and devices, which was earlier only done with subtractive toolroom methods such as CNC milling, turning, and precision grinding. In the 2010s, additive manufacturing entered production to a much greater extent.
Additive manufacturing of food is being developed by squeezing out food, layer by layer, into three-dimensional objects. A large variety of foods are appropriate candidates, such as chocolate and candy, and flat foods such as crackers, pasta, and pizza.
3D printing has entered the world of clothing, with fashion designers experimenting with 3D-printed bikinis, shoes, and dresses. In commercial production Nike is using 3D printing to prototype and manufacture the 2012 Vapor Laser Talon football shoe for players of American football, and New Balance is 3D manufacturing custom-fit shoes for athletes. 3D printing has come to the point where companies are printing consumer grade eyewear with on-demand custom fit and styling (although they cannot print the lenses). On-demand customization of glasses is possible with rapid prototyping.
Vanessa Friedman, fashion director and chief fashion critic at The New York Times, says 3D printing will have a significant value for fashion companies down the road, especially if it transforms into a print-it-yourself tool for shoppers. "There's real sense that this is not going to happen anytime soon," she says, "but it will happen, and it will create dramatic change in how we think both about intellectual property and how things are in the supply chain." She adds: "Certainly some of the fabrications that brands can use will be dramatically changed by technology."
- In early 2014, Swedish supercar manufacturer Koenigsegg announced the One:1, a supercar that utilizes many components that were 3D printed. Urbee is the name of the first car in the world car mounted using the technology 3D printing (its bodywork and car windows were "printed").
- In 2014, Local Motors debuted Strati, a functioning vehicle that was entirely 3D Printed using ABS plastic and carbon fiber, except the powertrain. In May 2015 Airbus announced that its new Airbus A350 XWB included over 1000 components manufactured by 3D printing.
- In 2015, a Royal Air Force Eurofighter Typhoon fighter jet flew with printed parts. The United States Air Force has begun to work with 3D printers, and the Israeli Air Force has also purchased a 3D printer to print spare parts.
- In 2017, GE Aviation revealed that it had used design for additive manufacturing to create a helicopter engine with 16 parts instead of 900, with great potential impact on reducing the complexity of supply chains.
AM's impact on firearms involves two dimensions: new manufacturing methods for established companies, and new possibilities for the making of do-it-yourself firearms. In 2012, the US-based group Defense Distributed disclosed plans to design a working plastic 3D printed firearm "that could be downloaded and reproduced by anybody with a 3D printer." After Defense Distributed released their plans, questions were raised regarding the effects that 3D printing and widespread consumer-level CNC machining may have on gun control effectiveness.
Surgical uses of 3D printing-centric therapies have a history beginning in the mid-1990s with anatomical modeling for bony reconstructive surgery planning. Patient-matched implants were a natural extension of this work, leading to truly personalized implants that fit one unique individual. Virtual planning of surgery and guidance using 3D printed, personalized instruments have been applied to many areas of surgery including total joint replacement and craniomaxillofacial reconstruction with great success. One example of this is the bioresorbable trachial splint to treat newborns with tracheobronchomalacia  developed at the University of Michigan. The use of additive manufacturing for serialized production of orthopedic implants (metals) is also increasing due to the ability to efficiently create porous surface structures that facilitate osseointegration. The hearing aid and dental industries are expected to be the biggest area of future development using the custom 3D printing technology.
In March 2014, surgeons in Swansea used 3D printed parts to rebuild the face of a motorcyclist who had been seriously injured in a road accident. In May 2018, 3D printing has been used for the kidney transplant to save a three-year-old boy. As of 2012[update], 3D bio-printing technology has been studied by biotechnology firms and academia for possible use in tissue engineering applications in which organs and body parts are built using inkjet printing techniques. In this process, layers of living cells are deposited onto a gel medium or sugar matrix and slowly built up to form three-dimensional structures including vascular systems. Recently, a heart-on-chip has been created which matches properties of cells.
In 2018, 3D printing technology was used for the first time to create a matrix for cell immobilization in fermentation. Propionic acid production by Propionibacterium acidipropionici immobilized on 3D-printed nylon beads was chosen as a model study. It was shown that those 3D-printed beads were capable to promote high density cell attachment and propionic acid production, which could be adapted to other fermentation bioprocesses.
In 2005, academic journals had begun to report on the possible artistic applications of 3D printing technology. As of 2017, domestic 3D printing was reaching a consumer audience beyond hobbyists and enthusiasts. Off the shelf machines were incerasingly capable of producing practical household applications, for example, ornamental objects. Some practical examples include a working clock and gears printed for home woodworking machines among other purposes. Web sites associated with home 3D printing tended to include backscratchers, coat hooks, door knobs, etc.
3D printing, and open source 3D printers in particular, are the latest technology making inroads into the classroom. Some authors have claimed that 3D printers offer an unprecedented "revolution" in STEM education. The evidence for such claims comes from both the low-cost ability for rapid prototyping in the classroom by students, but also the fabrication of low-cost high-quality scientific equipment from open hardware designs forming open-source labs. Future applications for 3D printing might include creating open-source scientific equipment.
In the last several years 3D printing has been intensively used by in the cultural heritage field for preservation, restoration and dissemination purposes. Many Europeans and North American Museums have purchased 3D printers and actively recreate missing pieces of their relics. The Metropolitan Museum of Art and the British Museum have started using their 3D printers to create museum souvenirs that are available in the museum shops. Other museums, like the National Museum of Military History and Varna Historical Museum, have gone further and sell through the online platform Threeding digital models of their artifacts, created using Artec 3D scanners, in 3D printing friendly file format, which everyone can 3D print at home.
3D printed soft actuators is a growing application of 3D printing technology which has found its place in the 3D printing applications. These soft actuators are being developed to deal with soft structures and organs especially in biomedical sectors and where the interaction between human and robot is inevitable. The majority of the existing soft actuators are fabricated by conventional methods that require manual fabrication of devices, post processing/assembly, and lengthy iterations until maturity in the fabrication is achieved. To avoid the tedious and time-consuming aspects of the current fabrication processes, researchers are exploring an appropriate manufacturing approach for effective fabrication of soft actuators. Thus, 3D printed soft actuators are introduced to revolutionise the design and fabrication of soft actuators with custom geometrical, functional, and control properties in a faster and inexpensive approach. They also enable incorporation of all actuator components into a single structure eliminating the need to use external joints, adhesives, and fasteners.
3D printing has existed for decades within certain manufacturing industries where many legal regimes, including patents, industrial design rights, copyright, and trademark may apply. However, there is not much jurisprudence to say how these laws will apply if 3D printers become mainstream and individuals or hobbyist communities begin manufacturing items for personal use, for non-profit distribution, or for sale.
Any of the mentioned legal regimes may prohibit the distribution of the designs used in 3D printing, or the distribution or sale of the printed item. To be allowed to do these things, where an active intellectual property was involved, a person would have to contact the owner and ask for a licence, which may come with conditions and a price. However, many patent, design and copyright laws contain a standard limitation or exception for 'private', 'non-commercial' use of inventions, designs or works of art protected under intellectual property (IP). That standard limitation or exception may leave such private, non-commercial uses outside the scope of IP rights.
Patents cover inventions including processes, machines, manufactures, and compositions of matter and have a finite duration which varies between countries, but generally 20 years from the date of application. Therefore, if a type of wheel is patented, printing, using, or selling such a wheel could be an infringement of the patent.
Copyright covers an expression in a tangible, fixed medium and often lasts for the life of the author plus 70 years thereafter. If someone makes a statue, they may have copyright on the look of that statue, so if someone sees that statue, they cannot then distribute designs to print an identical or similar statue.
When a feature has both artistic (copyrightable) and functional (patentable) merits, when the question has appeared in US court, the courts have often held the feature is not copyrightable unless it can be separated from the functional aspects of the item. In other countries the law and the courts may apply a different approach allowing, for example, the design of a useful device to be registered (as a whole) as an industrial design on the understanding that, in case of unauthorized copying, only the non-functional features may be claimed under design law whereas any technical features could only be claimed if covered by a valid patent.
Gun legislation and administration
The US Department of Homeland Security and the Joint Regional Intelligence Center released a memo stating that "significant advances in three-dimensional (3D) printing capabilities, availability of free digital 3D printable files for firearms components, and difficulty regulating file sharing may present public safety risks from unqualified gun seekers who obtain or manufacture 3D printed guns" and that "proposed legislation to ban 3D printing of weapons may deter, but cannot completely prevent, their production. Even if the practice is prohibited by new legislation, online distribution of these 3D printable files will be as difficult to control as any other illegally traded music, movie or software files."
Attempting to restrict the distribution of gun plans via the Internet has been likened to the futility of preventing the widespread distribution of DeCSS, which enabled DVD ripping. After the US government had Defense Distributed take down the plans, they were still widely available via the Pirate Bay and other file sharing sites. Downloads of the plans from the UK, Germany, Spain, and Brazil were heavy. Some US legislators have proposed regulations on 3D printers to prevent them from being used for printing guns. 3D printing advocates have suggested that such regulations would be futile, could cripple the 3D printing industry, and could infringe on free speech rights, with early pioneer of 3D printing Professor Hod Lipson suggesting that gunpowder could be controlled instead.
Internationally, where gun controls are generally stricter than in the United States, some commentators have said the impact may be more strongly felt since alternative firearms are not as easily obtainable. Officials in the United Kingdom have noted that producing a 3D printed gun would be illegal under their gun control laws. Europol stated that criminals have access to other sources of weapons but noted that as technology improves, the risks of an effect would increase.
In the United States, the FAA has anticipated a desire to use additive manufacturing techniques and has been considering how best to regulate this process. The FAA has jurisdiction over such fabrication because all aircraft parts must be made under FAA production approval or under other FAA regulatory categories. In December 2016, the FAA approved the production of a 3D printed fuel nozzle for the GE LEAP engine. Aviation attorney Jason Dickstein has suggested that additive manufacturing is merely a production method, and should be regulated like any other production method. He has suggested that the FAA's focus should be on guidance to explain compliance, rather than on changing the existing rules, and that existing regulations and guidance permit a company "to develop a robust quality system that adequately reflects regulatory needs for quality assurance."
Health and safety
Research on the health and safety concerns of 3D printing is new and in development due to the recent proliferation of 3D printing devices. In 2017 the European Agency for Safety and Health at Work has published a discussion paper on the processes and materials involved in 3D printing, potential implications of this technology for occupational safety and health and avenues for controlling potential hazards. Most concerns involve gas and material exposures, in particular nanomaterials, material handling, static electricity, moving parts and pressures.
A National Institute for Occupational Safety and Health (NIOSH) study noted particle emissions from a fused filament peaked a few minutes after printing started and returned to baseline levels 100 minutes after printing ended. Emissions from fused filament printers can include a large number of ultrafine particles and volatile organic compounds (VOCs).
The toxicity from emissions varies by source material due to differences in size, chemical properties, and quantity of emitted particles. Excessive exposure to VOCs can lead to irritation of the eyes, nose, and throat, headache, loss of coordination, and nausea and some of the chemical emissions of fused filament printers have also been linked to asthma. Based on animal studies, carbon nanotubes and carbon nanofibers sometimes used in fused filament printing can cause pulmonary effects including inflammation, granulomas, and pulmonary fibrosis when at the nanoparticle size.
As of March 2018,[update] the US Government has set 3D printer emission standards for only a limited number of compounds. Furthermore, the few established standards address factory conditions, not home or other environments in which the printers are likely to be used.
Carbon nanoparticle emissions and processes using powder metals are highly combustible and raise the risk of dust explosions. At least one case of severe injury was noted from an explosion involved in metal powders used for fused filament printing. Other general health and safety concerns include the hot surface of UV lamps and print head blocks, high voltage, ultraviolet radiation from UV lamps, and potential for mechanical injury from moving parts.
The problems noted in the NIOSH report were reduced by using manufacturer-supplied covers and full enclosures, using proper ventilation, keeping workers away from the printer, using respirators, turning off the printer if it jammed, and using lower emission printers and filaments. At least one case of severe injury was noted from an explosion involved in metal powders used for fused filament. Personal protective equipment has been found to be the least desirable control method with a recommendation that it only be used to add further protection in combination with approved emissions protection.
Hazards to health and safety also exist from post-processing activities done to finish parts after they have been printed. These post-processing activities can include chemical baths, sanding, polishing, or vapor exposure to refine surface finish, as well as general subtractive manufacturing techniques such as drilling, milling, or turning to modify the printed geometry. Any technique that removes material from the printed part has the potential to generate particles that can be inhaled or cause eye injury if proper personal protective equipment is not used, such as respirators or safety glasses. Caustic baths are often used to dissolve support material used by some 3D printers that allows them to print more complex shapes. These baths require personal protective equipment to prevent injury to exposed skin.
Although no occupational exposure limits specific to 3D printer emissions exist, certain source materials used in 3D printing, such as carbon nanofiber and carbon nanotubes, have established occupational exposure limits at the nanoparticle size.
Since 3-D imaging creates items by fusing materials together, there runs the risk of layer separation in some devices made using 3-D Imaging. For example, in January 2013, the US medical device company, DePuy, recalled their knee and hip replacement systems. The devices were made from layers of metal, and shavings had come loose – potentially harming the patient. 
Additive manufacturing, starting with today's infancy period, requires manufacturing firms to be flexible, ever-improving users of all available technologies to remain competitive. Advocates of additive manufacturing also predict that this arc of technological development will counter globalization, as end users will do much of their own manufacturing rather than engage in trade to buy products from other people and corporations. The real integration of the newer additive technologies into commercial production, however, is more a matter of complementing traditional subtractive methods rather than displacing them entirely.
The futurologist Jeremy Rifkin claimed that 3D printing signals the beginning of a third industrial revolution, succeeding the production line assembly that dominated manufacturing starting in the late 19th century.
Since the 1950s, a number of writers and social commentators have speculated in some depth about the social and cultural changes that might result from the advent of commercially affordable additive manufacturing technology. Amongst the more notable ideas to have emerged from these inquiries has been the suggestion that, as more and more 3D printers start to enter people's homes, the conventional relationship between the home and the workplace might get further eroded. Likewise, it has also been suggested that, as it becomes easier for businesses to transmit designs for new objects around the globe, so the need for high-speed freight services might also become less. Finally, given the ease with which certain objects can now be replicated, it remains to be seen whether changes will be made to current copyright legislation so as to protect intellectual property rights with the new technology widely available.
As 3D printers became more accessible to consumers, online social platforms have developed to support the community. This includes websites that allow users to access information such as how to build a 3D printer, as well as social forums that discuss how to improve 3D print quality and discuss 3D printing news, as well as social media websites that are dedicated to share 3D models. RepRap is a wiki based website that was created to hold all information on 3d printing, and has developed into a community that aims to bring 3D printing to everyone. Furthermore, there are other sites such as Pinshape, Thingiverse and MyMiniFactory, which were created initially to allow users to post 3D files for anyone to print, allowing for decreased transaction cost of sharing 3D files. These websites have allowed greater social interaction between users, creating communities dedicated to 3D printing.
Some call attention to the conjunction of Commons-based peer production with 3D printing and other low-cost manufacturing techniques. The self-reinforced fantasy of a system of eternal growth can be overcome with the development of economies of scope, and here, society can play an important role contributing to the raising of the whole productive structure to a higher plateau of more sustainable and customized productivity. Further, it is true that many issues, problems, and threats arise due to the democratization of the means of production, and especially regarding the physical ones. For instance, the recyclability of advanced nanomaterials is still questioned; weapons manufacturing could become easier; not to mention the implications for counterfeiting and on IP. It might be maintained that in contrast to the industrial paradigm whose competitive dynamics were about economies of scale, Commons-based peer production 3D printing could develop economies of scope. While the advantages of scale rest on cheap global transportation, the economies of scope share infrastructure costs (intangible and tangible productive resources), taking advantage of the capabilities of the fabrication tools. And following Neil Gershenfeld in that "some of the least developed parts of the world need some of the most advanced technologies," Commons-based peer production and 3D printing may offer the necessary tools for thinking globally but acting locally in response to certain needs.
Larry Summers wrote about the "devastating consequences" of 3D printing and other technologies (robots, artificial intelligence, etc.) for those who perform routine tasks. In his view, "already there are more American men on disability insurance than doing production work in manufacturing. And the trends are all in the wrong direction, particularly for the less skilled, as the capacity of capital embodying artificial intelligence to replace white-collar as well as blue-collar work will increase rapidly in the years ahead." Summers recommends more vigorous cooperative efforts to address the "myriad devices" (e.g., tax havens, bank secrecy, money laundering, and regulatory arbitrage) enabling the holders of great wealth to "avoid paying" income and estate taxes, and to make it more difficult to accumulate great fortunes without requiring "great social contributions" in return, including: more vigorous enforcement of anti-monopoly laws, reductions in "excessive" protection for intellectual property, greater encouragement of profit-sharing schemes that may benefit workers and give them a stake in wealth accumulation, strengthening of collective bargaining arrangements, improvements in corporate governance, strengthening of financial regulation to eliminate subsidies to financial activity, easing of land-use restrictions that may cause the real estate of the rich to keep rising in value, better training for young people and retraining for displaced workers, and increased public and private investment in infrastructure development—e.g., in energy production and transportation.
Michael Spence wrote that "Now comes a … powerful, wave of digital technology that is replacing labor in increasingly complex tasks. This process of labor substitution and disintermediation has been underway for some time in service sectors—think of ATMs, online banking, enterprise resource planning, customer relationship management, mobile payment systems, and much more. This revolution is spreading to the production of goods, where robots and 3D printing are displacing labor." In his view, the vast majority of the cost of digital technologies comes at the start, in the design of hardware (e.g. 3D printers) and, more important, in creating the software that enables machines to carry out various tasks. "Once this is achieved, the marginal cost of the hardware is relatively low (and declines as scale rises), and the marginal cost of replicating the software is essentially zero. With a huge potential global market to amortize the upfront fixed costs of design and testing, the incentives to invest [in digital technologies] are compelling."
Spence believes that, unlike prior digital technologies, which drove firms to deploy underutilized pools of valuable labor around the world, the motivating force in the current wave of digital technologies "is cost reduction via the replacement of labor." For example, as the cost of 3D printing technology declines, it is "easy to imagine" that production may become "extremely" local and customized. Moreover, production may occur in response to actual demand, not anticipated or forecast demand. Spence believes that labor, no matter how inexpensive, will become a less important asset for growth and employment expansion, with labor-intensive, process-oriented manufacturing becoming less effective, and that re-localization will appear in both developed and developing countries. In his view, production will not disappear, but it will be less labor-intensive, and all countries will eventually need to rebuild their growth models around digital technologies and the human capital supporting their deployment and expansion. Spence writes that "the world we are entering is one in which the most powerful global flows will be ideas and digital capital, not goods, services, and traditional capital. Adapting to this will require shifts in mindsets, policies, investments (especially in human capital), and quite possibly models of employment and distribution."
Naomi Wu regards the usage of 3D printing in the Chinese classroom (where rote memorization is standard) to teach design principles and creativity as the most exciting recent development of the technology, and more generally regards 3D printing as being the next desktop publishing revolution.
- 3D bioprinting
- 3D Manufacturing Format
- Additive Manufacturing File Format
- Cloud manufacturing
- Computer numeric control
- Delta robot
- Laser cutting
- Limbitless Solutions
- List of 3D printer manufacturers
- List of common 3D test models
- List of emerging technologies
- List of notable 3D printed weapons and parts
- Magnetically assisted slip casting
- MakerBot Industries
- Milling center
- Self-replicating machine
- Volumetric printing
- Excell, Jon. "The rise of additive manufacturing". The Engineer. Retrieved 2013-10-30.
- "Additive manufacturing — General Principles — Overview of process categories and feedstock". ISO/ASTM International Standard (17296-2:2015(E)). 2015.
- "Most used 3D printing technologies 2017-2018 | Statistic". Statista. Retrieved 2018-12-02.
- Taufik, Mohammad; Jain, Prashant K. (12 January 2014). "Role of build orientation in layered manufacturing: a review". International Journal of Manufacturing Technology and Management. 27 (1/2/3): 47–73. doi:10.1504/IJMTM.2013.058637.
- Bin Hamzah, Hairul Hisham; Keattch, Oliver; Covill, Derek; Patel, Bhavik Anil (2018). "The effects of printing orientation on the electrochemical behaviour of 3D printed acrylonitrile butadiene styrene (ABS)/carbon black electrodes". 8. Nature Publishing group: 9135. doi:10.1038/s41598-018-27188-5.
- "Google Ngram of the term additive manufacturing".
- "ISO/ASTM 52900:2015 - Additive manufacturing -- General principles -- Terminology". www.iso.org. Retrieved 2017-06-15.
- Zelinski, Peter (4 August 2017), "Additive manufacturing and 3D printing are two different things", Additive Manufacturing, retrieved 2017-08-11.
- Jane Bird (8 August 2012). "Exploring the 3D printing opportunity". Financial Times. Retrieved 2012-08-30.
- Hideo Kodama, "A Scheme for Three-Dimensional Display by Automatic Fabrication of Three-Dimensional Model," IEICE Transactions on Electronics (Japanese Edition), vol. J64-C, No. 4, pp. 237–41, April 1981
- Hideo Kodama, "Automatic method for fabricating a three-dimensional plastic model with photo-hardening polymer," Review of Scientific Instruments, Vol. 52, No. 11, pp. 1770–73, November 1981
- Jean-Claude, Andre. "Disdpositif pour realiser un modele de piece industrielle". National De La Propriete Industrielle.
- Mendoza, Hannah Rose (15 May 2015). "Alain Le Méhauté, The Man Who Submitted Patent For SLA 3D Printing Before Chuck Hull". 3dprint.com.
- Moussion, Alexandre (2014). "Interview d'Alain Le Méhauté, l'un des pères de l'impression (Interview of Alain Le Mehaute, one of the 3D printinf technologies fathers) 3D". Primante 3D.
- "3D Printing: What You Need to Know". PCMag.com. Retrieved 2013-10-30.
- Apparatus for Production of Three-Dimensional Objects by Stereolithography (8 August 1984)
- Freedman, David H (2012). "Layer By Layer". Technology Review. 115 (1): 50–53.
- Amon, C. H.; Beuth, J. L.; Weiss, L. E.; Merz, R.; Prinz, F. B. (1998). "Shape Deposition Manufacturing With Microcasting: Processing, Thermal and Mechanical Issues" (PDF). Journal of Manufacturing Science and Engineering. 120 (3). Retrieved 2014-12-20.
- Beck, J.E.; Fritz, B.; Siewiorek, Daniel; Weiss, Lee (1992). "Manufacturing Mechatronics Using Thermal Spray Shape Deposition" (PDF). Proceedings of the 1992 Solid Freeform Fabrication Symposium. Archived from the original (PDF) on 24 December 2014. Retrieved 2014-12-20.
- Prinz, F. B.; Merz, R.; Weiss, Lee (1997). Ikawa, N., ed. Building Parts You Could Not Build Before. Proceedings of the 8th International Conference on Production Engineering. 2-6 Boundary Row, London SE1 8HN, UK: Chapman & Hall. pp. 40–44.
- "How expiring patents are ushering in the next generation of 3D printing".
- GrabCAD, GE jet engine bracket challenge
- Zelinski, Peter (2 June 2014), "How do you make a howitzer less heavy?", Modern Machine Shop
- Pearce, Joshua M.; Morris Blair, Christine; Laciak, Kristen J.; Andrews, Rob; Nosrat, Amir; Zelenika-Zovko, Ivana (2010). "3-D Printing of Open Source Appropriate Technologies for Self-Directed Sustainable Development". Journal of Sustainable Development. 3 (4). doi:10.5539/jsd.v3n4p17.
- b. Mtaho, Adam; r.Ishengoma, Fredrick (2014). "3D Printing: Developing Countries Perspectives". International Journal of Computer Applications. 104 (11): 30. Bibcode:2014IJCA..104k..30R. doi:10.5120/18249-9329.
- "Filabot: Plastic Filament Maker". Kickstarter. Retrieved 2018-12-01.
- "3D Incorporated about page". 3D Incorporated. Retrieved 2018-07-31.
- "Gigabot Proves Even 3D Printing is Bigger in Texas". Make Magazine. 2015-04-10. Retrieved 2018-07-31.
- Jackson, Beau (2018-03-12). "re:3D launches Kickstarter for Gigabot X its greenest 3D printer yet". 3D Pprinting Industry]. Retrieved 2018-07-31.
- Jacobs, Paul Francis (1 January 1992). Rapid Prototyping & Manufacturing: Fundamentals of Stereolithography. Society of Manufacturing Engineers. ISBN 978-0-87263-425-1.
- Azman, Abdul Hadi; Vignat, Frédéric; Villeneuve, François (2018-04-29). "CAD TOOLS AND FILE FORMAT PERFORMANCE EVALUATION IN DESIGNING LATTICE STRUCTURES FOR ADDITIVE MANUFACTURING". Jurnal Teknologi. 80 (4). ISSN 2180-3722.
- "3D solid repair software – Fix STL polygon mesh files – LimitState:FIX". Print.limitstate.com. Retrieved 2016-01-04.
- "3D Printing Pens". yellowgurl.com. Retrieved 2016-08-09.
- "Model Repair Service". Modelrepair.azurewebsites.net. Retrieved 2016-01-04.
- "Magics, the Most Powerful 3D Printing Software | Software for additive manufacturing". Software.materialise.com. Retrieved 2016-01-04.
- "netfabb Cloud Services". Netfabb.com. 15 May 2009. Retrieved 2016-01-04.
- "How to repair a 3D scan for printing". Anamarva.com. Retrieved 2016-01-04.
- Fausto Bernardini, Holly E. Rushmeier (2002). "The 3D Model Acquisition Pipeline GAS" (PDF). Comput. Graph. Forum. 21 (2): 149–72. doi:10.1111/1467-8659.00574.
- "Objet Connex 3D Printers". Objet Printer Solutions. Retrieved 2012-01-31.
- "Design Guide: Preparing a File for 3D Printing" (PDF). Xometry.
- "Advantages of 3D printing over traditional manufacturing". 3DPrinterPrices.net. 10 July 2013. Retrieved 2017-02-16.
- "How to 3D-print super-fast and have an awesome finishing". 3dprinterchat. Retrieved 5 May 2016.
- "How to Smooth 3D-Printed Parts".
- Delfs, P.; T̈ows, M.; Schmid, H.-J. (October 2016). "Optimized build orientation of additive manufactured parts for improved surface quality and build time". Additive Manufacturing. 12: 314–320. doi:10.1016/j.addma.2016.06.003. ISSN 2214-8604.
- Kraft, Caleb. "Smoothing Out Your 3D Prints With Acetone Vapor". Make. Make. Retrieved 2016-01-05.
- Haselhuhn, Amberlee S.; Gooding, Eli J.; Glover, Alexandra G.; Anzalone, Gerald C.; Wijnen, Bas; Sanders, Paul G.; Pearce, Joshua M. (2014). "Substrate Release Mechanisms for Gas Metal Arc Weld 3D Aluminum Metal Printing". 3D Printing and Additive Manufacturing. 1 (4): 204. doi:10.1089/3dp.2014.0015.
- Haselhuhn, Amberlee S.; Wijnen, Bas; Anzalone, Gerald C.; Sanders, Paul G.; Pearce, Joshua M. (2015). "In situ formation of substrate release mechanisms for gas metal arc weld metal 3-D printing". Journal of Materials Processing Technology. 226: 50. doi:10.1016/j.jmatprotec.2015.06.038.
- Sherman, Lilli Manolis (15 November 2007). "A whole new dimension – Rich homes can afford 3D printers". The Economist.
- Wohlers, Terry. "Factors to Consider When Choosing a 3D Printer (WohlersAssociates.com, Nov/Dec 2005)".
- www.3ders.org (25 September 2012). "Casting aluminum parts directly from 3D printed PLA parts". 3ders.org. Retrieved 2013-10-30.
- Standard Terminology for Additive Manufacturing – General Principles – Terminology. ASTM International. September 2013, Retrieved 2016-07-11
- "How Selective Heat Sintering Works". THRE3D.com. Archived from the original on 3 February 2014. Retrieved 3 February 2014.
- Woern, Aubrey; Byard, Dennis; Oakley, Robert; Fiedler, Matthew; Snabes, Samantha (2018-08-12). "Fused Particle Fabrication 3-D Printing: Recycled Materials' Optimization and Mechanical Properties". Materials. 11 (8): 1413. doi:10.3390/ma11081413. PMC 6120030. PMID 30103532.
- "Aluminum-powder DMLS-printed part finishes race first".
- Hiemenz, Joe. "Rapid prototypes move to metal components (EE Times, 3/9/2007)".
- "Rapid Manufacturing by Electron Beam Melting". SMU.edu.
- Johnson, R. Colin. "Cheaper avenue to 65 nm? (EE Times, 3/30/2007)".
- "The World's Smallest 3D Printer". TU Wien. 12 September 2011.
- "3D-printing multi-material objects in minutes instead of hours". Kurzweil Accelerating Intelligence. 22 November 2013.
- St. Fleur, Nicholas (17 March 2015). "3-D Printing Just Got 100 Times Faster". The Atlantic. Retrieved 19 March 2015.
- Beese, Allison M.; Carroll, Beth E. (2015). "Review of Mechanical Properties of Ti-6Al-4V Made by Laser-Based Additive Manufacturing Using Powder Feedstock". JOM. 68 (3): 724. Bibcode:2016JOM....68c.724B. doi:10.1007/s11837-015-1759-z.
- Gibson, Ian; Rosen, David; Stucker, Brent (2015). "Additive Manufacturing Technologies". doi:10.1007/978-1-4939-2113-3. ISBN 978-1-4939-2112-6.
- "3D Printing: Challenges and Opportunities for International Relations". Council on Foreign Relations. 23 October 2013. Archived from the original on 28 October 2013. Retrieved 30 October 2013.
- "Despite Market Woes, 3D Printing Has a Future Thanks to Higher Education - Bold". 2 December 2015.
- "UMass Amherst Library Opens 3-D Printing Innovation Center".
- Kalish, Jon. "A Space For DIY People To Do Their Business (NPR.org, November 28, 2010)". Retrieved 2012-01-31.
- Taufik, Mohammad; Jain, Prashant K. (10 December 2016). "Additive Manufacturing: Current Scenario". Proceedings of International Conference On: Advanced Production and Industrial Engineering -ICAPIE 2016: 380–386.
- Vincent & Earls 2011
- Wong, Venessa. "A Guide to All the Food That's Fit to 3D Print (So Far)". Bloomberg.com.
- "Did BeeHex Just Hit 'Print' to Make Pizza at Home?". Retrieved 28 May 2016.
- "Foodini 3D Printer Cooks Up Meals Like the Star Trek Food Replicator". Retrieved 27 January 2015.
- "3D Printed Clothing Becoming a Reality". Resins Online. 17 June 2013. Retrieved 2013-10-30.
- Michael Fitzgerald (28 May 2013). "With 3-D Printing, the Shoe Really Fits". MIT Sloan Management Review. Retrieved 2013-10-30.
- Sharma, Rakesh (10 September 2013). "3D Custom Eyewear The Next Focal Point For 3D Printing". Forbes.com. Retrieved 2013-09-10.
- Alvarez, Edgar. "Fashion and technology will inevitably become one". Engagdet.
- "Koenigsegg One:1 Comes With 3D Printed Parts". Business Insider. Retrieved 2014-05-14.
- tecmundo.com.br/ Conheça o Urbee, primeiro carro a ser fabricado com uma impressora 3D
- Eternity, Max. "The Urbee 3D-Printed Car: Coast to Coast on 10 Gallons?".
- on YouTube
- "Local Motors shows Strati, the world's first 3D-printed car". 13 January 2015.
- Simmons, Dan (6 May 2015). "Airbus had 1,000 parts 3D printed to meet deadline". BBC. Retrieved 2015-11-27.
- Zitun, Yoav (27 July 2015). "The 3D printer revolution comes to the IAF". Ynet News. Retrieved 2015-09-29.
- Zelinski, Peter (31 March 2017), "GE team secretly printed a helicopter engine, replacing 900 parts with 16", Modern Machine Shop, retrieved 2017-04-09.
- Greenberg, Andy (23 August 2012). "'Wiki Weapon Project' Aims To Create A Gun Anyone Can 3D-Print At Home". Forbes. Retrieved 2012-08-27.
- Poeter, Damon (24 August 2012). "Could a 'Printable Gun' Change the World?". PC Magazine. Retrieved 2012-08-27.
- Samsel, Aaron. "3D Printers, Meet Othermill: A CNC machine for your home office (VIDEO)". Guns.com. Retrieved 2013-10-30.
- "The Third Wave, CNC, Stereolithography, and the end of gun control". Popehat. Retrieved 2013-10-30.
- Rosenwald, Michael S. (25 February 2013). "Weapons made with 3-D printers could test gun-control efforts". Washington Post.
- "Making guns at home: Ready, print, fire". The Economist. 16 February 2013. Retrieved 2013-10-30.
- Rayner, Alex (6 May 2013). "3D-printable guns are just the start, says Cody Wilson". The Guardian. London.
- Manjoo, Farhad (8 May 2013). "3-D-printed gun: Yes, it will be possible to make weapons with 3-D printers. No, that doesn't make gun control futile". Slate.com. Retrieved 2013-10-30.
- Eppley, B. L.; Sadove, A. M. (1 November 1998). "Computer-generated patient models for reconstruction of cranial and facial deformities". J Craniofac Surg. 9 (6): 548–556. doi:10.1097/00001665-199811000-00011. PMID 10029769.
- Poukens, Jules (1 February 2008). "A classification of cranial implants based on the degree of difficulty in computer design and manufacture". The International Journal of Medical Robotics and Computer Assisted Surgery. 4 (1): 46–50. doi:10.1002/rcs.171. PMID 18240335.
- Zopf, David A.; Hollister, Scott J.; Nelson, Marc E.; Ohye, Richard G.; Green, Glenn E. (2013). "Bioresorbable Airway Splint Created with a Three-Dimensional Printer". New England Journal of Medicine. 368 (21): 2043. doi:10.1056/NEJMc1206319. PMID 23697530.
- Moore, Calen (11 February 2014). "Surgeons have implanted a 3-D-printed pelvis into a U.K. cancer patient". fiercemedicaldevices.com. Retrieved 2014-03-04.
- Perry, Keith (12 March 2014). "Man makes surgical history after having his shattered face rebuilt using 3D printed parts". London: The Daily Telegraph. Retrieved 2014-03-12.
- "Boy gets kidney transplant thanks to 3D printing". Sky News. Retrieved 2018-06-11.
- "3D-printed sugar network to help grow artificial liver". BBC News.
- "Harvard engineers create the first fully 3D printed heart-on-a-chip".
- Belgrano, Fabricio dos Santos; Diegel, Olaf; Pereira, Nei; Hatti-Kaul, Rajni (2018). "Cell immobilization on 3D-printed matrices: A model study on propionic acid fermentation". Bioresource Technology. 249: 777–782. doi:10.1016/j.biortech.2017.10.087. PMID 29136932.
- Séquin, Carlo H. (2005). "Rapid prototyping". Communications of the ACM. 48 (6): 66–73. Bibcode:1985CACM...28...22S. doi:10.1145/1064830.1064860. INIST:16817711.
- ewilhelm. "3D printed clock and gears". Instructables.com. Retrieved 2013-10-30.
- 23 January 2012 (23 January 2012). "Successful Sumpod 3D printing of a herringbone gear". 3d-printer-kit.com. Archived from the original on 2 November 2013. Retrieved 2013-10-30.
- ""backscratcher" 3D Models to Print - yeggi".
- Schelly, C., Anzalone, G., Wijnen, B., & Pearce, J. M. (2015). "Open-source 3-D printing Technologies for education: Bringing Additive Manufacturing to the Classroom." Journal of Visual Languages & Computing.
- Grujović, N., Radović, M., Kanjevac, V., Borota, J., Grujović, G., & Divac, D. (September 2011). "3D printing technology in education environment." In 34th International Conference on Production Engineering (pp. 29–30).
- Mercuri, Rebecca; Meredith, Kevin (2014). "An educational venture into 3D Printing". 2014 IEEE Integrated STEM Education Conference. pp. 1–6. doi:10.1109/ISECon.2014.6891037. ISBN 978-1-4799-3229-0.
- J. Irwin, J.M. Pearce, D. Opplinger, and G. Anzalone. The RepRap 3-D Printer Revolution in STEM Education, 121st ASEE Annual Conference and Exposition, Indianapolis, IN. Paper ID #8696 (2014).
- Zhang, Chenlong; Anzalone, Nicholas C.; Faria, Rodrigo P.; Pearce, Joshua M. (2013). "Open-Source 3D-Printable Optics Equipment". PLoS ONE. 8 (3): e59840. Bibcode:2013PLoSO...859840Z. doi:10.1371/journal.pone.0059840. PMC 3609802. PMID 23544104.
- Pearce, Joshua M. 2012. "Building Research Equipment with Free, Open-Source Hardware." Science 337 (6100): 1303–1304
- Scopigno, R.; Cignoni, P.; Pietroni, N.; Callieri, M.; Dellepiane, M. (2017). "Digital Fabrication Techniques for Cultural Heritage: A Survey]" (PDF). Computer Graphics Forum. 36 (1): 6–21. doi:10.1111/cgf.12781.
- "Museum uses 3D printing to take fragile maquette by Thomas Hart Benton on tour through the States". Archived from the original on 17 November 2015.
- "British Museum releases 3D printer scans of artefacts". 4 November 2014.
- "Threeding Uses Artec 3D Scanning Technology to Catalog 3D Models for Bulgaria's National Museum of Military History". 3dprint.com. 20 February 2015.
- Zolfagharian, Ali; Kouzani, Abbas Z.; Khoo, Sui Yang; Moghadam, Amir Ali Amiri; Gibson, Ian; Kaynak, Akif (2016). "Evolution of 3D printed soft actuators". Sensors and Actuators A: Physical. 250: 258–272. doi:10.1016/j.sna.2016.09.028.
- "3D Printing Technology Insight Report, 2014, patent activity involving 3D-Printing from 1990–2013" (PDF). Retrieved 2014-06-10.
- Thompson, Clive (30 May 2012). "3-D Printing's Legal Morass".
- Weinberg, Michael (January 2013). "What's the Deal with copyright and 3D printing?" (PDF). Institute for Emerging Innovation. Retrieved 2013-10-30.
- "Homeland Security bulletin warns 3D-printed guns may be 'impossible' to stop". Fox News. 23 May 2013. Retrieved 2013-10-30.
- "Controlled by Guns". Quiet Babylon. 7 May 2013. Retrieved 2013-10-30.
- "3dprinting". Joncamfield.com. Retrieved 2013-10-30.
- "State Dept Censors 3D Gun Plans, Citing 'National Security'". News.antiwar.com. 10 May 2013. Retrieved 2013-10-30.
- "Wishful Thinking Is Control Freaks' Last Defense Against 3D-Printed Guns". Reason.com. 8 May 2013. Retrieved 2013-10-30.
- Lennard, Natasha (10 May 2013). "The Pirate Bay steps in to distribute 3-D gun designs". Salon.com. Archived from the original on 19 May 2013. Retrieved 2013-10-30.
- "US demands removal of 3D printed gun blueprints". neurope.eu. Retrieved 2013-10-30.
- "España y EE.UU. lideran las descargas de los planos de la pistola de impresión casera". ElPais.com. 9 May 2013. Retrieved 2013-10-30.
- "Sen. Leland Yee Proposes Regulating Guns From 3-D Printers". CBS Sacramento. 8 May 2013. Retrieved 2013-10-30.
- "Schumer Announces Support For Measure To Make 3D Printed Guns Illegal".
- "Four Horsemen of the 3D Printing Apocalypse". Makezine.com. 30 June 2011. Archived from the original on 30 March 2013. Retrieved 2013-10-30.
- Ball, James (10 May 2013). "US government attempts to stifle 3D-printer gun designs will ultimately fail". The Guardian. London.
- Gadgets (18 January 2013). "Like It Or Not, 3D Printing Will Probably Be Legislated". TechCrunch. Retrieved 2013-10-30.
- Klimas, Liz (19 February 2013). "Engineer: Don't Regulate 3D Printed Guns, Regulate Explosive Gun Powder Instead". The Blaze. Retrieved 2013-10-30.
- Beckhusen, Robert (15 February 2013). "3-D Printing Pioneer Wants Government to Restrict Gunpowder, Not Printable Guns". Wired. Retrieved 2013-10-30.
- Bump, Philip (10 May 2013). "How Defense Distributed Already Upended the World". The Atlantic Wire. Archived from the original on 19 May 2013. Retrieved 2013-10-30.
- "News". European Plastics News. Retrieved 2013-10-30.
- Cochrane, Peter (21 May 2013). "Peter Cochrane's Blog: Beyond 3D Printed Guns". TechRepublic. Retrieved 2013-10-30.
- Gilani, Nadia (6 May 2013). "Gun factory fears as 3D blueprints put online by Defense Distributed". Metro.co.uk. Retrieved 2013-10-30.
- "Liberator: First 3D-printed gun sparks gun control controversy". Digitaljournal.com. Retrieved 2013-10-30.
- "First 3D Printed Gun 'The Liberator' Successfully Fired". International Business Times UK. 7 May 2013. Archived from the original on 29 October 2013. Retrieved 2013-10-30.
- Debra Werner, FAA prepares guidance for wave of 3D-printed aerospace parts (20 October 2017)
- "eCFR — Code of Federal Regulations". www.ecfr.gov.
- Beau Jackson, FAA to launch eight-year additive manufacturing road map (21 October 2017)
- Jason Dickstein, Additive Manufacturing – Does it Fit into the Regulations?, ARSA Hotline (5 May 2017) (explaining how to treat additive manufacturing under the FAA's existing production regulations)
- See Brett Levanto, Embracing Drones and 3D Printing In The Regulatory Framework, MRO Network (10 Jan 2018) (describing the Dickstein article)
- EU-OSHA, European Agency for Safety and Health (7 June 2017). "3D Printing and monitoring of workers: a new industrial revolution?". osha.europa.eu. Retrieved 2017-10-31.
- Fuges, Christina M. "Changing the Rules". www.additivemanufacturing.media. Retrieved 2017-10-30.
- "Control Measures Critical for 3D Printers". NIOSH Research Rounds. U.S. National Institute for Occupational Safety and Health. June 2016. Retrieved 2017-07-03.
- Azimi, Parham; Zhao, Dan; Pouzet, Claire; Crain, Neil E.; Stephens, Brent (2 February 2016). "Emissions of Ultrafine Particles and Volatile Organic Compounds from Commercially Available Desktop Three-Dimensional Printers with Multiple Filaments". Environmental Science & Technology. 50 (3): 1260–1268. Bibcode:2016EnST...50.1260A. doi:10.1021/acs.est.5b04983. ISSN 0013-936X. PMID 26741485.
- Stefaniak, Aleksandr B.; LeBouf, Ryan F.; Yi, Jinghai; Ham, Jason; Nurkewicz, Timothy; Schwegler-Berry, Diane E.; Chen, Bean T.; Wells, J. Raymond; Duling, Matthew G. (3 July 2017). "Characterization of chemical contaminants generated by a desktop fused deposition modeling 3-dimensional Printer". Journal of Occupational and Environmental Hygiene. 14 (7): 540–550. doi:10.1080/15459624.2017.1302589. ISSN 1545-9624. PMID 28440728.
- "Is 3D Printing Safe". American Industrial Hygiene Association. 3 May 2017. Retrieved 2017-07-29.
- "Current Intelligence Bulletin 65: Occupational Exposure to Carbon Nanotubes and Nanofibers". U.S. National Institute for Occupational Safety and Health. 2013. Retrieved 2017-06-20.
- Pelley, Janet (2018-03-26). "3-D printer emissions raise concerns and prompt controls". Chemical & Engineering News. 96 (13). ISSN 1520-605X. OCLC 244304576. Retrieved 2018-10-18.
- Turkevich, Leonid A.; Fernback, Joseph; Dastidar, Ashok G.; Osterberg, Paul (1 May 2016). "Potential explosion hazard of carbonaceous nanoparticles: screening of allotropes". Combustion and Flame. 167: 218–227. doi:10.1016/j.combustflame.2016.02.010. PMC 4959120. PMID 27468178.
- "After explosion, US Department of Labor's OSHA cites 3-D printing firm for exposing workers to combustible metal powder, electrical hazards". U.S. Occupational Safety and Health Administration. 20 May 2014. Archived from the original on 3 August 2017. Retrieved 3 July 2017.
- "3D Printing Safety" (PDF). Carnegie Mellon University Environmental Health & Safety.
- "Ultimate Guide to Finishing 3D Printed Parts | Fictiv - Hardware Guide". www.fictiv.com. Retrieved 2017-10-19.
- Dahm, Matthew M.; Evans, Douglas E.; Schubauer-Berigan, Mary K.; Birch, Eileen M.; Fernback, Joseph E. (1 July 2012). "Occupational Exposure Assessment in Carbon Nanotube and Nanofiber Primary and Secondary Manufacturers". The Annals of Occupational Hygiene. 56 (5): 542–56. doi:10.1093/annhyg/mer110. ISSN 0003-4878. PMC 4522689. PMID 22156567.
- Matthews, Richard. "Proposed new regulations for 3D printed medical devices must go further". The Conversation. Retrieved 2018-10-03.
- Albert 2011
- "Jeremy Rifkin and The Third Industrial Revolution Home Page". The third industrial revolution.com. Retrieved 2016-01-04.
- "A third industrial revolution". The Economist. 21 April 2012. Retrieved 2016-01-04.
- "Confronting a New 'Era of Duplication'? 3D Printing, Replicating Technology and the Search for Authenticity in George O. Smith's Venus Equilateral Series". Durham University. Retrieved 21 July 2013.
- "Materializing information: 3D printing and social change". Retrieved 2014-01-13.
- "Additive Manufacturing: A supply chain wide response to economic uncertainty and environmental sustainability" (PDF). Archived from the original (PDF) on 15 January 2014. Retrieved 2014-01-11.
- "Materializing information: 3D printing and social change". Retrieved 2014-03-30.
- "RepRap Options". Retrieved 2014-03-30.
- "3D Printing". Retrieved 2014-03-30.
- "Thingiverse". Retrieved 2014-03-30.
- Kostakis, V. (2013): At the Turning Point of the Current Techno-Economic Paradigm: Commons-Based Peer Production, Desktop Manufacturing and the Role of Civil Society in the Perezian Framework.. In: TripleC, 11(1), 173–190.
- Kostakis, Vasilis; Papachristou, Marios (2014). "Commons-based peer production and digital fabrication: The case of a Rep Rap-based, Lego-built 3D printing-milling machine". Telematics and Informatics. 31 (3): 434–43. doi:10.1016/j.tele.2013.09.006.
- Kostakis, Vasilis; Fountouklis, Michail; Drechsler, Wolfgang (2013). "Peer Production and Desktop Manufacturing". Science, Technology, & Human Values. 38 (6): 773–800. doi:10.1177/0162243913493676. JSTOR 43671156.
- Campbell, Thomas, Christopher Williams, Olga Ivanova, and Banning Garrett. (2011): Could 3D Printing Change the World? Technologies, Potential, and Implications of Additive Manufacturing Archived 15 August 2013 at the Wayback Machine.. Washington: Atlantic Council of the United States
- Bradshaw, Simon, Adrian Bowyer, and Patrick Haufe (2010): The Intellectual Property Implications of Low-Cost 3D Printing. In: SCRIPTed 7
- Gershenfeld, Neil (2007): FAB: The Coming Revolution on your Desktop: From Personal Computers to Personal Fabrication. Cambridge: Basic Books, p. 13–14
- Larry Summers, The Inequality Puzzle, Democracy: A Journal of Ideas, Issue #32, Spring 2014
- Michael Spence, Labor's Digital Displacement (22 May 2014), Project Syndicate
- Andre, Helene (29 November 2017). "Naomi Wu – "My visibility allows me to direct more attention to important issues and other deserving women"". Women in 3D Printing. Retrieved 2017-12-03.
- Tran, Jasper (2017). "Reconstructionism, IP and 3D Printing". Available on SSRN. SSRN 2842345.
- Tran, Jasper (2016). "Press Clause and 3D Printing". Northwestern Journal of Technology and Intellectual Property. 14: 75–80. SSRN 2614606.
- Tran, Jasper (2016). "3D-Printed Food". Minnesota Journal of Law, Science and Technology. 17: 855–80. SSRN 2710071.
- Tran, Jasper (2015). "To Bioprint or Not to Bioprint". North Carolina Journal of Law and Technology. 17: 123–78. SSRN 2562952.
- Tran, Jasper (2015). "Patenting Bioprinting". Harvard Journal of Law and Technology Digest. SSRN 2603693.
- Tran, Jasper (2015). "The Law and 3D Printing". John Marshall Journal of Information Technology and Privacy Law. 31: 505–20.
- Lindenfeld, Eric; et al. (2015). "Strict Liability and 3D-Printed Medical Devices". Yale Journal of Law and Technology. SSRN 2697245.
- Dickel, Sascha; Schrape, Jan-Felix (2016). "Materializing Digital Futures". The Decentralized and Networked Future of Value Creation. Progress in IS. pp. 163–78. doi:10.1007/978-3-319-31686-4_9. ISBN 978-3-319-31684-0.
- "Results of Make Magazine's 2015 3D Printer Shootout". docs.google.com. Retrieved 1 June 2015.
- "Evaluation Protocol for Make Magazine's 2015 3D Printer Shootout". makezine.com. Retrieved 1 June 2015.
- Vincent; Earls, Alan R. (February 2011). "Origins: A 3D Vision Spawns Stratasys, Inc". Today's Machining World. 7 (1): 24–25. Archived from the original on 10 March 2012.
- "Heat Beds in 3D Printing – Advantages and Equipment". Boots Industries. Retrieved 7 September 2015.
- Albert, Mark (17 January 2011). "Subtractive plus additive equals more than ( - + + = > )". Modern Machine Shop. 83 (9): 14.
- Stephens, B.; Azimi, P.; El Orch, Z.; Ramos, T. (2013). "Ultrafine particle emissions from desktop 3D printers". Atmospheric Environment. 79: 334–339. Bibcode:2013AtmEn..79..334S. doi:10.1016/j.atmosenv.2013.06.050.
- Easton, Thomas A. (November 2008). "The 3D Trainwreck: How 3D Printing Will Shake Up Manufacturing". Analog. 128 (11): 50–63.
- Wright, Paul K. (2001). 21st Century Manufacturing. New Jersey: Prentice-Hall Inc.
- "3D printing: a new industrial revolution - Safety and health at work - EU-OSHA". osha.europa.eu. Retrieved 2017-07-28.
- Hod., Lipson, (2013-02-11). Fabricated : the new world of 3D printing. Kurman, Melba. Indianapolis, Indiana. ISBN 9781118350638. OCLC 806199735.