A. Design drawings review:1. Mechanical design review. functions and structure design review.2. Tooling review.3. Production review.B. Prototyping:1. Material:Aluminum, Copper, ABS, PC, PP, Silicone, Rubber, etc2. Processing way: CNC machining, SLA, 3D Printing, PU casting, etc3. Dimension inspection.4. Assembly Trial5. Function test6. Feedback..