3D printing (3DP) is a kind of rapid prototyping technology. It is a technology that constructs objects by printing them layer-by-layer using adhesive materials such as powdered metal or plastic on the basis of digital model files. 3D printing is usually done using digital material printers. It is often used in mold manufacturing, industrial design and other fields to make models, and then gradually used in the direct manufacturing of some products. There are already parts printed using this technology. The technology is used in jewelry, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and other fields.

3d printing is calculated according to the weight of the material, such as how many grams of ABS material you need to make a model, the market price per gram is 2 yuan, you give the model people use software to calculate it for you immediately, it has nothing to do with the precision. Because others are sure to do as detailed as possible, you can see this in Aurora Evo and other manufacturers on Taobao. Photos can not, to model the format can only be played. If there is no model file, you can only use 3D scanner to generate 3D model.