3D printing includes: Yellow and white resin printing, PC transparent parts, high temperature resistant materials, nylon materials, Yellow Wax Printing, soft glue printing, and Metal Printing, common for resin printing, usually PC printing use transparent parts but very fragile Yellow Wax Printing is used in fine grain printing after the use of duplicating, other printing have their defects. 3d printing is mainly used for the verification of the shape and structure, and has some defects such as high temperature resistance, Brittleness, stickiness and paint resistance.