Quick answer
The right prototype method depends on what you need to learn, not what process feels most advanced.
Best route = build objective + quantity + fidelity needs + urgency + budget + commitment tolerance
If the objective is still learning, flexible low-commitment processes usually beat more production-like routes.
What each route is best at
| Route | Best for | Weakest point |
|---|---|---|
| 3D printing | Fast learning, geometry checks, concept demos | Surface quality and scalable unit economics |
| CNC machining | Functional validation, precise geometry, durable prototypes | Higher unit cost at larger quantities |
| Vacuum casting | Looks-like parts and low-volume bridge production | Not a final mass-production route |
| Bridge tooling | Pilot runs and early market validation | Still requires more commitment than true prototype routes |
| Pilot injection | Production-like learning when volume and confidence are high | Painful if the design is still moving |
A prototype is not successful because it looks like production. It is successful because it teaches the team what the next decision should be.
Questions to answer before choosing a route
- What must this build prove?
- How many units are genuinely needed?
- How much cosmetic fidelity matters right now?
- How painful would a late design change be?
- Is the team optimising for learning speed or production realism?