3D printing is suitable for prototypes and complex shapes, but it is not always the best choice. If you need a metal part, precise fits or a smooth functional surface, CNC milling is the answer.
How CNC milling works
A rotating cutting tool removes material from a solid block according to a digital model. This is subtractive manufacturing, the opposite of 3D printing, which adds material. The result is a part with a solid structure and a smooth surface without visible layers.
Which materials can be milled
- Aluminium: light and easy to machine, suitable for housings, structural parts and fixtures.
- Brass and copper: used in electrical engineering and for decorative elements.
- Acrylic (PMMA): transparent, suitable for covers, light panels and cut-outs.
- POM: a low-friction plastic, suitable for gears and sliding surfaces.
- Wood and MDF: furniture, decorations, reliefs and lettering.
If you need another material, we will assess its machinability and suggest an approach.
CNC milling and 3D printing
| CNC milling | 3D printing | |
|---|---|---|
| Materials | Metals, hard plastics, wood | Plastics, resins, nylon |
| Surface | Smooth, no layers | Depends on the technology |
| Complex internal shapes | Limited | Very good |
| Best for | Functional parts, moulds, metal components | Prototypes, complex shapes, small series |
The technologies often complement each other. You can print a prototype, verify its shape and then mill the final part from metal.
Reverse engineering
CNC milling can be combined with 3D scanning. If you only have a physical part without a drawing, we first scan it, create its model and make the part from it.
Surface finishing
Deburring edges and basic finishing are part of production. For anodising, painting or galvanic finishes, we agree the scope and procedure individually.
How to start
The best input is a 3D model in STEP format or a drawing in DXF format. If you only have a drawing in PDF or a physical sample, write to us and we will suggest how to proceed.
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