Repair and simplify
3MF Repair and Simplify Online
3MF repair checks a model before cutting. It can identify common mesh problems, close suitable holes, weld crack points, turn faces the right way, and optionally reduce triangles while keeping the surface within a chosen tolerance.
What the repair pass checks
- Open boundaries and holes.
- Crack points that can be welded within the chosen distance.
- Faces whose direction is inconsistent with the surrounding shell.
- Overlapping shells that need to be united or reviewed.
- Triangle reduction settings and the resulting surface tolerance.
Repair before splitting
Repair is designed for the intact model. If a model has already been split or plane-cut, undo those changes before running the repair pass. A clean, closed input gives color splitting and sketch cutting a better starting point, but no automatic repair can guarantee a perfect print for every model.
Simplification has a trade-off
Reducing triangles can make a large model easier to handle, but it changes the surface. The tool reports the before and after triangle count and keeps a part unchanged if simplification would leave it open. Inspect curved or detailed surfaces carefully.
Access and privacy
The repair operation runs in the browser worker. It is marked as a Pro tool in the product, so the download and project access rules still apply. The source file is not uploaded to a repair server.
3MF repair before you split or cut
Use 3MF repair when the model preview shows holes, open boundaries, crack points, flipped faces, or overlapping shells that could make a split unreliable. Repair & simplify is intended for the intact input, before you split 3MF by color or create a plane cut. Running the 3MF repair pass after several cuts can make it harder to tell which issue came from the source and which came from the edit.
A 3MF repair pass can improve the starting mesh, but 3MF repair does not redesign the model or prove that the final print will succeed. Keep the original file, compare the repaired preview with it, and inspect important curved surfaces after simplification. If a repair would leave a part open, the tool keeps that part unchanged rather than silently presenting a worse mesh.
Repair, simplify, then verify
- Record the reported holes, crack points, flipped faces, and overlapping shells before applying 3MF repair.
- Use a conservative weld distance so nearby details are not joined accidentally.
- Treat triangle reduction as an optional trade-off for file size and handling speed.
- Re-open the repaired model in the splitter and preview a small color split or test cut before a long job; 3MF repair is a starting point for that check.
- Check the final export in your slicer; a repaired mesh still needs printer-specific supports and settings.
Try Split3MF in your browser
Open a real model, preview the operation, and decide what to export.
Try a sample model