Repair STL Online
Automatically fix supported STL mesh defects before 3D printing. Close open boundary holes, weld split vertices, unify face normals, and export a clean Binary STL.
Technical principle
Inspect the before-and-after counts in STL Checker or STL Viewer before manufacturing. The exporter turns the source into a bounded triangle mesh and exposes the selected units, tessellation, or image settings before download. Review the bounding…
Parameters at a glance
| Parameter | Value | Why it matters |
|---|---|---|
| Input format | .STL | Accepted source file extension. |
| Output format | STL | Geometry or archive produced by this route. |
| File size | Up to 250 MB | Upload guardrail before parsing or conversion. |
| Mesh review | Preview, normals, open edges | Check geometry before download or slicing. |
Automated STL Mesh Healing for FDM and SLA Printing
The repair pipeline performs vertex welding, degenerate triangle removal, normal unification, and boundary-loop patching when the topology supports a safe correction. Complex non-manifold regions remain flagged for manual review.
- Vertex welding: merge unjoined duplicate vertices within a small tolerance.
- Degenerate triangle removal: strip zero-area and collapsed faces.
- Normal unification: recalculate consistent outward winding across connected shells.
- Boundary hole patching: triangulate recognized open loops into a closed manifold region.
Frequently Asked Questions
What STL errors can this repair tool fix?
It handles supported unwelded seams, inverted normals, degenerate triangles, and open boundary holes on STL files up to 250 MB.
Does repairing STL change outer dimensions or smooth sharp edges?
No. The repair pass preserves intact triangles and changes only supported topology defects and face winding.
Why repair STL before converting to STEP?
CAD kernels need a closed mesh to create a solid body. Repairing supported holes first reduces the chance of importing a disconnected surface shell.