STL Repair
Repair broken STL files online. Close holes and fix non-manifold geometry with a clean, watertight remesh, then download a print-ready STL.
Repair STL files for clean 3D prints
Upload an STL that your slicer complains about and get back a watertight, print-ready STL. The repair rebuilds the surface as one clean, closed mesh, which fixes holes, gaps, non-manifold edges, and overlapping faces in one pass.
How to repair an STL file
- Upload your .stl (OBJ, GLB, and FBX also work).
- Run it.
- Download the repaired STL and open it in your slicer.
Features
- Watertight output. Holes and gaps are closed, so the slicer sees one solid object.
- Fixes non-manifold geometry. Stray edges, internal faces, and overlapping shells are rebuilt into a single clean surface.
- Great for scans and AI models. Meshes from 3D scanners and AI generators are often full of holes; this makes them printable.
- Nothing to install. Runs in your browser, no mesh-editing software needed.
FAQ
How do I fix a broken STL file?
Upload it here and run it. The model is rebuilt as a watertight mesh and exported as a new STL.
What problems does it fix?
Holes, open edges, non-manifold geometry, flipped or overlapping faces, and multiple overlapping shells: the usual reasons a slicer refuses a file or prints it with gaps.
Will it change my model?
The surface is rebuilt evenly, so very fine details, sharp edges, and thin text can soften slightly. For most prints the difference is invisible, but compare the result with your original for precision parts.
My model came from an AI generator. Will this help?
Yes. AI-generated and scanned models are the most common candidates. Make one with Image to STL, then repair it here if your slicer flags errors.
Can I check the result first?
Yes, open the repaired file in the STL Viewer.
Browse all 3D printing and STL tools on Mitte.