3d Printing

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3D printing
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For methods of applying a 2-D image on a 3-D surface, see pad printing. Part of the series on the
History of printing|
Woodblock printing| 200|
Movable type| 1040|
Intaglio| 1430s|
Printing press| 1454|
Lithography| 1796|
Chromolithography| 1837|
Rotary press| 1843|
Flexography| 1873|
Mimeograph| 1876|
Hot metal typesetting| 1886|
Offset press| 1903|
Screen-printing| 1907|
Dye-sublimation| 1957|
Phototypesetting| 1960s|
Photocopier| 1960s|
Pad printing| 1960s|
Laser printer| 1969|
Dot matrix printer| 1970|
Thermal printer| |
Inkjet printer| 1976|
3D printing| 1986|
Stereolithography| 1986|
Digital press| 1993|
v • d • e|
3D printing is a unique form of printing that is related to traditional rapid prototyping technology. A three dimensional object is created by layering and connecting successive cross sections of material. 3D Printers are generally faster, more affordable and easier to use than other additive fabrication technologies. While prototyping dominates current uses, 3D printing offers tremendous potential for retail consumer uses.[1] Contents[hide] * 1 Technologies * 2 Resolution * 3 Applications * 4 RepRap open source 3d printer * 5 References * 6 See also * 7 External links | [edit] Technologies

Previous means of producing a prototype typically took man-hours, many tools, and skilled labor. For example, after a new street light luminaire was digitally designed, drawings were sent to skilled craftsmen where the design on paper was painstakingly followed and a three-dimensional prototype was produced in wood by utilizing an entire shop full of expensive wood working machinery and tools. This typically was not a speedy process and costs of the skilled labor were not cheap. Hence the need to develop a faster and cheaper process to produce prototypes. As an answer to this need, rapid prototyping was born. One variation of 3D printing consists of an inkjet printing system. Layers of a fine powder (plaster, corn starch, or resins) are selectively bonded by "printing" an adhesive from the inkjet printhead in the shape of each cross-section as determined by a CAD file. This technology is the only one that allows for the printing of full color prototypes. It is also recognized as the fastest method. Alternately, these machines feed liquids, such as photopolymer, through an inkjet-type printhead to form each layer of the model. These Photopolymer Phase machines use an ultraviolet (UV) flood lamp mounted in the print head to cure each layer as it is deposited. Fused deposition modeling (FDM), a technology also used in traditional rapid prototyping, uses a nozzle to deposit molten polymer onto a support structure, layer by layer. Another approach is selective fusing of print media in a granular bed. In this variation, the unfused media serves to support overhangs and thin walls in the part being produced, reducing the need for auxiliary temporary supports for the workpiece. Finally, ultrasmall features may be made by the 3D microfabrication technique of 2-photon photopolymerization. In this approach, the desired 3D object is traced out in a block of gel by a focused laser. The gel is cured to a solid only in the places where the laser was focused, due to the nonlinear nature of photoexcitation, and then the remaining gel is washed away. Feature sizes of under 100 nm are easily produced, as well as complex structures such as moving and interlocked parts.[2] Each technology has its advantages and drawbacks, and consequently some companies offer a choice between powder and polymer as the material from which the object emerges. [3]. Generally, the main considerations are speed, cost of the printed prototype, cost of the 3D printer, choice of materials, color capabilities, etc.[4] Unlike "traditional" additive systems such as stereolithography, 3D printing is optimized...
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