3D printing is ideal for testing an idea: it is fast and needs no tooling. But when you move from one prototype to dozens or hundreds of pieces, both the economics and the demands on the part change.
Prototype: flexibility matters
With the first versions, the aim is to check shape, dimensions and function. Changing the model between versions means only editing a file. Even complex shapes that would be laborious to machine can be printed.
Small series: where 3D printing ends
For dozens of pieces, 3D printing is often still a good choice, especially for complex shapes. Limits can be material properties, surface finish and print time at larger quantities.
When to move to CNC milling
For larger series, metal parts, or higher demands on surface and fit, it is worth considering CNC milling. The part then has properties closer to the final product. For large quantities, injection moulding may also be suitable, but it requires an investment in a mould.
| 3D printing | CNC milling | |
|---|---|---|
| Suitable quantity | Single pieces to smaller series | Smaller to larger series |
| Changing the model | Simple | Requires a new program |
| Materials | Plastics, resins, nylon | Metals, hard plastics, wood |
| Surface | Depends on the technology | Smooth, without layers |
The line between the technologies depends on the shape of the part, the material and the budget. That is why it is worth assessing it for a specific project.
Tip: Before a large series, it is worth making a smaller pilot batch and testing the part in real operation. This helps you avoid costly changes after a larger quantity has been made.
Combining technologies
You do not have to choose one or the other. They are often combined: the prototype is printed, the model is adjusted once the shape is approved, and the final part is milled from metal. We can help you decide where the move between technologies makes sense.
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