In the last century, the earliest prototype is made by sla rapid prototyping technology in western country. Without CNC machining at that time, the material is type of resin, not stiff enough. But as sla model, it helped many designers and investors to save so much cost and time in early stage of product development.

SLS prototyping is only one of production ways in rapid prototype field. When customer wanted the prototype to be made from Nylon. Most of time, it's a good choice to do it by CNC machining. But because of nylon material can not be splited and glued, that means it has to be made as a whole piece.

Nowadays, metal prototype can be made by 3D printer and cnc machining, and other processed, such as: sheet metal, welding .rapid casting, .etc. But the production cost of metal part is too much with 3D printing .and surface is rough, not easy to polish. In western country, many prototype manufacturers have 3D printing machine for printing metal part.

CNC machining is already very mature. Has been widely used in various fields of industrial production, automobile manufacturing, mold making, aerospace and so on. A variety of materials can be CNC machined, parts with high precision, excellent assembly performance, the surface can be a variety of treatment, such as: anodizing, Powder coating, brushing. etc. At the same time, the production time is short, can be put into use soon.