Understanding STL and 3MF files

The formats we accept

• STL: the most common format. Stores only the shape as triangles — no units, colours or settings.
• 3MF: a newer format that stores units, multiple parts and colours. Preferred when your software supports it.
• OBJ: also accepted; colours and textures are not used for single-colour printing.

Exporting from your design app

1. 1Finish your model and combine or group the parts you want printed together.
2. 2Set the export units to millimetres.
3. 3Choose STL (binary) or 3MF.
4. 4Use a fine resolution so curves are smooth, but avoid extreme settings that make huge files.
5. 5Re-open the exported file in a viewer (or our 3D workspace) to confirm it looks right.

Downloaded models

If you downloaded a model from a sharing website, check its licence allows you to have it printed — especially for selling. We may decline models that infringe trademarks or copyrights.