In the field of traditional automobile manufacturing, the completion of auto parts often takes a long time to develop and test. This process, involving the production of mold, not only a long time, but also high cost. And once the problem is found, fixing the part also takes a long time. Metal 3D printing can quickly produce complex shapes, assembly-free parts, for the development of a prototype has brought great convenience and shorten the development cycle. Once test the problem, it can be fixed quickly, which greatly reducing the development costs of automotive parts.