Rapid Prototype is the automatic construction of physical objects using three-dimensional computer aided design (CAD) Data. RP system can directly produce functional parts in small production quantities. Parts produced in this way usually have an accuracy and surface finish inferior to those make by machining. The parts produced with appropriate post processing will have material qualities and properties close to the final product. More fundamentally the time to produce any part once the design data are available will be fast and can be in a matter of hours.