The hand board is also the prototype, which is the proofing before the mass production of the injection molding. It is the first step to verify the feasibility of the product. The most outstanding advantage of 3D printing technology is that it can directly generate parts of any shape from computer graphics data without any machining or any mold, thus greatly shortening the development cycle of products, improving productivity and reducing production costs. Compared with the traditional technology, it reduces the cost and material waste by abandoning the production line.