Repair STL Holes and Open Edges
Before Printing
Analyze your STL before slicing. See open edges, non-manifold connections and normal issues, then export a healed mesh when the boundary can be closed safely.
Repair STL Holes and Open Edges
Use the diagnostic preview to see whether a model is closed enough for slicing. The report separates open boundary edges, non-manifold connections, inconsistent face winding, and degenerate faces.
What the repair pass can change
- Boundary loops: Recognized convex and concave single closed loops can be triangulated and filled.
- Normal direction: Face winding is analyzed and can be reoriented when the mesh topology supports a safe correction.
- Repair comparison: Before and after counts show which holes, degenerate faces, and orientation errors changed.
- Complex defects: Self-intersections, nested inner holes, branch boundaries, and unresolved non-manifold regions remain flagged for manual review instead of being filled blindly.
Frequently Asked Questions
Will this repair every broken STL?
No repair tool can safely infer every intended surface. This workflow handles common boundary and winding problems, then reports anything that still needs manual cleanup.
How do I fix STL open edges?
Upload the file, inspect the highlighted boundaries, run the repair pass, and compare the remaining open-edge count before downloading.
Does this tool support batch repair?
ZIP batch conversion is supported separately. Repair currently handles one STL at a time so each topology change can be reviewed.