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When it comes to manufacturing in recent years, 3D printing, 3D printers, 3D printing, Rapid Prototyping, Rapid Manufacturing, digital manufacturing, and so on, are several hot words. These nouns, like a tornado, as if overnight in academia politics, media, finance, manufacturing has aroused billows. But how much do you think about these concepts? If you're not sure, there's an article here that can parse these terms in a comprehensive and complete way, so that people really understand "what is 3D printing" and "what is Rapid Manufacturing" .

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The Prusa i3 is an open-source fused deposition modeling 3D printer. Part of the RepRap project, it is the most used 3D printer in the world. The Prusa i3 was designed by Josef Průša in 2012 with the Prusa i3 MK2 being released in 2016 and the MK2S being released in 2017. The Prusa i3's comparable low cost and ease of construction and modification has made it popular in education and with hobbyists and professionals. Due to the printer being open source there have been many variants produced by companies and individuals worldwide, and like many other RepRap printers the Prusa i3 is capable of printing some of its own parts.

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RepRap is a 3D printer prototype (or 3D printer) that has a degree of self replication capability and prints most of its own (plastic) components. RepRap is the abbreviation of (replicating, rapid, prototyper). The prototype from software to hardware, is free and open source, and is released under the free software agreement GNU common public license GPL.
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3D Printing technology, also known as "Additive Manufacturing" technology. According to the American Society for testing and materials (ASTM) founded in 2009 to add the definition of manufacturing technology F42 Committee announced, "added manufacturing technology" is "a traditional processing method of material removal on the contrary, the three-dimensional digital model based on the commonly used layer manufacturing process of material combination, including adding synonyms add add, molding, process technology, adding layered manufacturing, layered manufacturing and forming".

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Polylactic acid (PLA) is a new biological and biodegradable material made from starch material from renewable plant resources (such as corn). The raw material of the starch is obtained by saccharification to obtain glucose, then glucose and certain bacteria are fermented to make high-purity lactic acid, and then a certain molecular weight polylactic acid is synthesized by chemical synthesis. It has good biodegradation, after use can be completely in nature microbial degradation under certain conditions, the final formation of carbon dioxide and water, do not pollute the environment, which is very beneficial to protect the environment, is recognized as environmentally friendly materials.
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With 3D printing rapidly changing the traditional way of production and lifestyle, 3D Printer can print out the various models we want. Work watching video using a mobile phone at home, but there is no suitable mobile phone support, 3D printer can help you achieve; when shopping saw ornament design high-class shops is very good, but no extra budget, 3D Printer can help you achieve; even, if you want to print the food, now 3D Printer can help to achieve.

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Laser Metal Deposition(LMD) for the first time in the last century in 90s by the U.S. Sandia National Laboratory is put forward, then in many places around the world have been developed by many universities and institutions are studied independently, so the name of this technology are.

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SLS manufacturing of metal parts, there are two methods, one is the indirect method, the polymer coated metal powder SLS; the second is the direct method, namely direct metal laser sintering (DirectMetalLaserSintering, DMLS).

Since the research of direct laser sintering of metal powders in Leuvne University of Chatofci in 1991, the direct sintering of metal powders by SLS process is one of the ultimate goals of rapid prototyping.

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The idea of SLM was first proposed by the German Institute of Fraunhofer in 1995. In 2002, the Institute achieved great success in the study of SLM technology. The world's first SLM device by the MCP group of companies under the jurisdiction of the German MCPHEK branch has launched at the end of 2003.
To obtain the compact laser forming, but also benefit from the great progress of rapid prototyping equipment in 2000 after laser (for use, advanced high energy fiber laser powder to improve the precision, etc.) completely melted powder metallurgy mechanism which is used for laser rapid forming of metal components.

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A patent applied by Swedish ARCAM company in 1994, The developed technique is called electron beam melting forming technology (Electron Beam Melting), ARCAM is also the first company in the world to commercialize electronic beam manufacturing, And the first generation of equipment was introduced in 2003.Since then, the Massachusetts Institute of Technology, NASA and other have developed their own rapid manufacturing system based on electron beam.
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