STL · OBJ · GLB
Free Online STL Repair
Fix non-manifold edges, holes and broken meshes — get a watertight file your slicer will accept. Free diagnosis and basic repair run locally in your browser; optional Deep Repair securely uploads the file for processing.
Drop a broken model — repair report in seconds
.stl .obj .glb .gltf — free, no signup, parsed in your browser
No broken model handy? Try one of these real AI-generated files:
See it on a real AI-generated model
This treasure chest came out of an AI image-to-3D generator looking flawless — and carrying 40,836 open edges and 166 floating shells. Toggle the tabs: same model, before and after deep repair. Rotate it yourself.
Your file gets the same treatment: drop it above, read the free diagnosis, and only pay if you want the full rebuild.
Why AI-generated models fail to print
- COMMONOpen edges & holes. Roughly half of AI-generated models (Meshy, Tripo, Hunyuan) have gaps the slicer can't close. We rebuild small holes into a sealed surface automatically.
- COMMONFloating debris. Generators often leave stray fragments scattered around the main body — we detect and remove tiny disconnected shells.
- HONESTWhat free repair can't do: large or complex holes need a full surface rebuild (Pro) to guarantee a watertight result. We tell you which case you're in — no silent failures.
- ANY SOURCENot tied to one generator. Even output labeled "print-ready" can fail a slicer check. Drop in any STL, OBJ or GLB — from this tool, another AI generator, or a 3D scan — and we'll diagnose it the same way.
STL Repair — FAQ
Is the STL repair really free?
Yes. Diagnosis and basic repair (filling small holes, removing floating debris, fixing non-manifold edges) run as WebAssembly in your browser and are free with no signup. Only deep repair — a full watertight surface rebuild with optional approximate surface-color transfer for self-contained GLB files — costs credits.
Is my file uploaded to a server?
Parsing, diagnosis and basic repair all happen locally in your browser tab. Only the optional deep repair uploads your model to our repair service. Its temporary input and output files are deleted within 48 hours.
Why does my AI-generated model fail to print?
Generators like Meshy, Tripo and Hunyuan optimize for how a model looks, not for whether it is watertight. The output often has open edges, non-manifold geometry or floating shells that a slicer rejects — even when it is labeled "print-ready". Our diagnosis shows exactly what is wrong.
What file formats can I repair?
STL, OBJ and GLB/glTF. You can repair a file and then convert it to another format with our free converters.
What if free repair cannot fully fix my model?
Large or complex holes need a full surface rebuild. We tell you when that is the case instead of silently failing — and deep repair (20 credits) rebuilds a watertight mesh while transferring approximate surface color from supported GLB files.