Online STL Repair Tool

Upload your STL file to Meshy's AI STL repair tool. The repair engine automatically detects and fixes non-manifold edges, holes, flipped normals, and intersecting faces, returning a clean, watertight mesh in about a minute. You can then download the repaired model, ready for your 3D printer slicer. OBJ and GLB files are supported too.

You can upload STL, OBJ, and GLB files up to 100 MB each. Once the repair is complete, download the fixed model in STL, OBJ, or GLB — ready for your 3D printer slicer, Blender, Unity, or any other 3D tool.

Meshy's AI repair fixes the most common 3D-printing mesh errors automatically: non-manifold edges and vertices, holes and gaps in the surface, flipped or inconsistent normals, self-intersections, and duplicate or isolated vertices. The result is a watertight, manifold mesh that slices cleanly for 3D printing.

Yes. The repaired mesh is watertight and manifold, which is exactly what a 3D printer slicer needs to generate valid toolpaths. Export the result as STL or 3MF and send it straight to your slicer — no extra cleanup required.

No. Meshy's AI handles the entire repair automatically — detecting mesh errors and rebuilding a clean topology for you. If you can upload a file, you can repair an STL. There is nothing to download and no 3D modeling software to learn.

You can start repairing STL files for free with trial credits and no credit card required. Paid plans add more credits and a commercial license so you can use your repaired models in products, client work, and commercial 3D printing.