Rapid prototyping technology was born in the late 1980s. It is a part prototype manufacturing technology integrating the latest achievements in the technical fields of mechanical engineering, CAD / CAM technology, reverse engineering technology, layered manufacturing technology, laser technology, numerical control technology and new materials. Generally speaking, rapid prototyping technology is to stack layers of materials into solid prototypes through rapid prototyping machines using three-dimensional CAD data. It is different from the traditional "removal" processing method. It adopts a new "growth" processing method. Its basic principle is to decompose the complex three-dimensional processing into the superposition of simple two-dimensional processing, so it is also called "laminated manufacturing". It can automatically, directly, quickly and accurately transform the design idea into a prototype with certain functions or directly manufacture parts, so as to provide an efficient and low-cost implementation means for the prototype production of parts and the verification of new design ideas. There are more than ten molding methods of rapid prototyping technology. The common rapid prototyping methods are: laser curing molding (SLA); Selective laser sintering (SLS); Laser lamination (LCM); Melt deposition molding (FDM).

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