Prototypes are called the first version in some cases. As the name implies, a small number of samples are generally made based on product appearance drawings and structural drawings before mass production, so as to check the product appearance or structural rationality and functional samples.

Commonly used domestic methods are: CNC machining, SLA, SLS, SLM, FDM, vacuum complex mold, low pressure infusion, sheet metal production, we will compare these in terms of definition, use of materials, software use, machinable parts, advantages and disadvantages. A kind of prototype processing method.