In the 1980s, 3D printing techniques were considered suitable only for the production of functional or aesthetic prototypes, and a more appropriate term for it at the time was rapid prototyping.[3] As of 2019, the precision, repeatability, and material range of 3D printing have increased to the point that some 3D printing processes are considered viable as an industrial-production technology

3D printing or additive manufacturing is the construction of a three-dimensional object from a CAD model or a digital 3D model.[1] It can be done in a variety of processes in which material is deposited, joined or solidified under computer control,[2] with material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer.

Plastic products are processed using plastic as the main raw material for life, industry and other supplies collectively, according to the different molding processes, can be divided into injection molding, compression molding, extrusion, blow molding, foam and other process products, are widely used in industry, agriculture, construction, transportation, national defense, aerospace and other fields.