How to Open STL Files in UltiMaker Cura
UltiMaker Cura is a free slicer used with UltiMaker printers and hundreds of other FDM machines.
Short answer · Built in
Yes. UltiMaker Cura opens STL files as shipped: File › Open File(s)… (Ctrl+O), or drag the file into the window.
Import STL into UltiMaker Cura, 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 UltiMaker CuraFile › Open File(s)… (Ctrl+O), or drag the file into the window.
- 3Check scale and orientationUltiMaker Cura works in millimetres and is Z-up. STL files are unitless (slicers assume millimetres), so the size depends on what the exporter assumed.
- 4Place it and sliceLay the flattest face on the plate, confirm the dimensions in the object panel, and slice. Slicers ignore textures and animation.
What comes through
| Shape | Yes, always. |
| Colours and materials | Ignored: UltiMaker Cura only uses the shape. |
| Textures | Not used by a slicer. |
| Animation | UltiMaker Cura doesn't play animation. |
Things to watch for
- STL is read in millimetres.
- Use the Lay flat or Select face to align to build plate tool before slicing awkward shapes.
Questions
- Does UltiMaker Cura support STL files?
- Yes. UltiMaker Cura opens STL files as shipped: File › Open File(s)… (Ctrl+O), or drag the file into the window.
- Why is my STL model the wrong size in UltiMaker Cura?
- STL files are unitless (slicers assume millimetres), while UltiMaker Cura works in millimetres. Scale the model after importing, then apply the scale before you continue.
- What is the best 3D format for UltiMaker Cura?
- 3MF and STL are the most reliable choice for UltiMaker Cura. STL is one of them, so you're already using a good option.
Menu names follow UltiMaker's current release. Check the official UltiMaker Cura 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 Spotted something out of date?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.