Conventional techniques make a mold with conformal cooling channel, which the channel is usually straight, with slow and uneven cooling effect. Metal 3D printing can be used to manufacture the complicated mold with conformal cooling channel. Compared with traditional molds, the conformal cooling channel molds can achieve fast and uniform cooling, while the mold stripping is faster and the effect is better. In addition, the air vent die made by the metal 3D printing can solve the difficulty which the traditional manufacturing technology can not be. The application of metal 3D printing technology makes the design of mold products become free and open, leading the production of mold products to be customized and complicated. Ultimately, to promote the development of the entire mold industry.