"3D printing" is a general term of "additive manufacturing" technology that adds materials layer by layer to manufacture 3D objects. Its core principle is "layered manufacturing, layer by layer superposition", similar to the process of triple integration of cylindrical coordinates in advanced mathematics. Unlike traditional "reduced material manufacturing", 3D printing technology integrates mechanical, material, computer, communication, control technology, and biomedical technologies, and has the advantages of shortening product development cycles, reducing research and development costs, and manufacturing complex shaped workpieces in one. In the future, it may have a significant impact on the production mode of the manufacturing industry and human lifestyle.

According to the forming mechanism of 3D printing, 3D printing is generally divided into two categories: deposition raw material manufacturing and bonding raw material manufacturing, covering more than ten specific 3D rapid manufacturing technologies. There are five more mature technologies with practical application potential: SLA stereolithography molding, FDM volume molding, LOM layered entity manufacturing, 3DP 3D powder bonding and SLS Selective laser sintering.