3D printing is a kind of rapid prototyping technology, which is based on digital model file, using powder metal or plastic and other adhesive materials to construct objects by layer printing.

3D printing is usually realized by digital technology material printer. In the past, it was often used in mold manufacturing, industrial design and other fields to make models. Now it is gradually used in the direct manufacturing of some products, and some parts have been printed with this technology. The technology has applications in jewelry, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information system, civil engineering, guns and other fields.