CNC machining is fast and low cost, and the processing material has the characteristics of high strength, high temperature resistance, high toughness, etc.; and the CNC machining model and processing form is not limited, such as grinding, polishing, oxidation, painting, sandblasting, silk-screening, UV, electroplating, etc. (especially the model that needs electroplating), the effect is completely comparable with the products produced by the mold, or even higher; in appearance, assembly, functional verification , CNC machining model production has been used as one of the mainstream of modern prototype processing.