3D Printing vs CNC: How to Choose
Compare cost, precision, materials, and lead time across additive and subtractive routes with a practical decision framework.
3D printing suits complex geometry and low-volume prototypes; CNC suits precision, strength, and production volumes. Batch size, tolerance, and geometry drive the choice.
1Cost comparison
Single prototypes: 3D printing is often cheaper with no tooling. Above ~100 pieces, CNC amortizes programming and fixtures. Material utilization is typically lower in additive processes.
2Precision comparison
CNC reaches ±0.01 mm for mating surfaces. FDM is often ±0.2–0.3 mm; SLA/SLS ±0.05–0.1 mm; metal LPBF around ±0.1 mm.
3Materials
CNC covers aluminum, steels, titanium, copper, and engineering plastics. Additive materials depend on process: FDM polymers, SLA resins, SLS nylon, metal powders for LPBF.
4When to use which
Choose 3D printing for internal channels, lattice structures, rapid validation, and personalized low-volume parts. Choose CNC for load-bearing metal parts, tight fits, and higher volumes.
Key points
- Complex internal cavities → 3D printing
- Tolerance below ±0.05 mm → CNC
- Batch > 500 → evaluate CNC cost first
- High-strength titanium → CNC or metal AM
- 1–5 prototypes → 3D printing is fastest
Want the best process recommended for your part?
AI Quote Chat