3D Printing vs CNC Machining
Two processes, two philosophies. Which one fits your project?
3D printing adds material layer by layer (additive), while CNC removes material from a block (subtractive). Each process has its strengths and limitations.
Detailed comparison
| Criteria | 3D Printing | CNC Machining | Recommendation |
|---|---|---|---|
| Cost | Starting from €5, very economical for prototypes | Starting from €30, more expensive but durable parts | 3D for small volumes, CNC for durability |
| Precision | ±0.1 to ±0.3mm depending on technology | ±0.02 to ±0.05mm, superior precision | CNC if tight tolerances required |
| Production speed | 2-7 days depending on technology and volume | 5-15 days depending on complexity and finishes | 3D generally faster |
| Material range | Varied plastics and resins | Metals (aluminum, steel, titanium) and hard plastics | CNC for durable metal parts |
| Complex geometries | Excellent for complex shapes without supports | Limited by cutting tools | 3D for complex geometries |
| Series production | Limited to around 1000 pieces economically | More expensive in small volumes, better in series | 3D up to 1000 pieces, CNC beyond |
| Surface finish | SLA gives good results, FDM requires post-processing | Excellent, Ra 0.8-3.2µm available | CNC for high-quality finish |
| Mechanical strength | SLS good, FDM/SLA less resistant | Excellent, especially with metals | CNC for high-performance parts |
Conclusion
In summary: 3D printing for complex geometries and rapid prototyping. CNC for precision, strength and metallic materials.