(1) Mold and Model Making: A 3D printed prototype is used as a template to make a mold for mass production of small models. Conceptual products such as 3D-printed small unmanned aerial vehicles and small cars have been introduced. (2) Aerospace, defense and military: direct manufacturing of parts and mechanisms with complex shapes, sizes, and special properties. (3) The food industry: Researchers have begun to try to print chocolates. Perhaps in the near future, many foods that look exactly the same would be "printed" using a food 3D printer. (4) Biomedical: Use 3D printing technology to manufacture bones, teeth, prostheses, skin, etc. Germany has used 3D printers to print out artificial capillaries. (5) Construction Engineering: Simulation of Landscape Modeling of Architectural Models, Simulation of Architectural Engineering and Construction (AEC). (6) Education and Teaching: Model verification scientific hypotheses are used for experiments and teaching in different disciplines. In some secondary schools, colleges and military colleges in North America, 3D printers have been used for teaching and research. (7) Personalized customization of jewelry and daily necessities: Web-based data download, e-commerce personalized print customization services. There are already some companies offering 3D printing services to customers.