We do prototypes by 3 ways normally:
1: CNC
Normally many kinds of material we can do: ABS, PC, PA, PP, PMMA, POM...
After the parts milling, we can do painting or silkprinting.
2: Si-mold
We will do a silicone mold first, and the duplicate the parts.
3: SLA or SLS
For some complicate construction parts, we will use this way normally.