The 3D printed metal products have the characteristics of castings, and can not be compared with forgings in many fields (the high hardness of the drill bit, the 3D printing is obviously not enough, and the aircraft casing needs to withstand the tension). However, the production efficiency of 3D printing is far less than that of castings, and even less than some forgings. While the 3D printed non-metal products do not have to bear the core cost of mold manufacturing, they also produce the same product and the marginal cost of producing 10,000 products (the design cost is everyone's), and it is not as low-cost as an injection molding machine. Rapid production of plastic parts.