How to Open STL Files in Blender
Blender is the free, open-source 3D suite used for modelling, sculpting, rendering and animation, and it is often the first stop for cleaning up a downloaded or generated model.
Short answer · Built in
Yes. Blender opens STL files as shipped: File › Import › STL (.stl).
Import STL into Blender, step by step
- 1Check the fileFind out what units the part was designed in. Almost every printable STL is in millimetres, but the file itself doesn't say.
- 2Import into BlenderFile › Import › STL (.stl).
- 3Check scale and orientationBlender works in metres and is Z-up (the glTF and FBX importers rotate Y-up files for you). STL files are unitless (slicers assume millimetres), so the size depends on what the exporter assumed.
- 4Check materials and animationSTL carries no colour or materials, and no animation. Look at the model under a neutral light before you build on it.
What comes through
| Shape | Yes, always. |
| Colours and materials | No: STL has no colour or materials. |
| Textures | STL doesn't store texture images. |
| Animation | No: STL has no animation. |
Things to watch for
- STL stores no units. Blender reads one unit as one metre, so a part designed in millimetres appears 1,000 times too large; set Scale to 0.001 in the import panel.
- Press Numpad . (period) after importing to frame the new object; tiny or huge models are usually a units issue, not a broken file.
Questions
- Does Blender support STL files?
- Yes. Blender opens STL files as shipped: File › Import › STL (.stl).
- Why is my STL model the wrong size in Blender?
- STL files are unitless (slicers assume millimetres), while Blender works in metres. Press Numpad . (period) after importing to frame the new object; tiny or huge models are usually a units issue, not a broken file.
- What is the best 3D format for Blender?
- GLB and FBX are the most reliable choice for Blender. If you have a choice when exporting, pick GLB over STL.
Menu names follow the Blender Foundation's current release. Check the official Blender documentation if your version differs.
Written with AI assistance by the Renderlyst team in October 2026. Format support reflects each app's current release as we understand it, and we link the official documentation so you can confirm it for your version. Spotted something out of date? Email alishbakhalid766@gmail.com.