Model making is an important processing category that involves producing scale models and prototypes of actual objects, from the initial stages of product development through to pre-mass production verification. It is used for design review, functional verification, presentations, and final shape confirmation before mold production, among other things, requiring high reproducibility and accuracy. Typical processing methods include cutting of resin and metal using CNC milling machines and machining centers; 3D printing (additive manufacturing) such as FDM, SLA, and SLS, which can handle complex shapes and short lead times; vacuum casting suitable for small-batch production; and manual processing requiring skilled techniques. By combining these technologies, optimal models are efficiently produced according to their purpose.