A group of techniques that are used to fabricate a model of a part or the entire assembly is known as "Rapid Prototyping". Three-dimensional computer aided design data is used for this purpose. There are various rapid prototyping technologies that are commercially available- SLA, SLS, LOM, FDM, SGC, and Ink Jet printing techniques. The most widely used technique is SLA technique, which was developed by 3D Systems. 3D printers were first used in rapid prototyping, which aided in visual presentation models. The prototypes are being manufactured in order to get an approval from the engineers before the ultimate production process. Presently, many engineering and design organizations use 3D printers for rapid prototyping.