How to Open OBJ Files in PrusaSlicer
PrusaSlicer is Prusa Research's free slicer for Prusa printers and many others.
Short answer · Built in
Yes. PrusaSlicer opens OBJ files as shipped: File › Import (Ctrl+I).
Import OBJ into PrusaSlicer, step by step
- 1Check the fileKeep the .mtl file and any texture images in the same folder as the .obj, with their original names; the OBJ refers to them by name.
- 2Import into PrusaSlicerFile › Import (Ctrl+I).
- 3Check scale and orientationPrusaSlicer works in millimetres and is Z-up. OBJ files are unitless, 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: PrusaSlicer only uses the shape. |
| Textures | Not used by a slicer. |
| Animation | PrusaSlicer doesn't play animation. |
Things to watch for
- Recent versions can use OBJ colours for multi-material painting.
- Press F to lay a model flat on a selected face, and use the Cut tool (C) to split tall models.
Questions
- Does PrusaSlicer support OBJ files?
- Yes. PrusaSlicer opens OBJ files as shipped: File › Import (Ctrl+I).
- Why is my OBJ model the wrong size in PrusaSlicer?
- OBJ files are unitless, while PrusaSlicer works in millimetres. PrusaSlicer asks to scale tiny models up from inches; check the size panel either way.
- What is the best 3D format for PrusaSlicer?
- 3MF and STL are the most reliable choice for PrusaSlicer. If you have a choice when exporting, pick 3MF over OBJ.
Menu names follow Prusa Research's current release. Check the official PrusaSlicer 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 Spotted something out of date?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.