如何修复非流形STL文件 — 免费浏览器修复工具

A mesh is non-manifold when any edge is shared by more or fewer than exactly two triangles, when a vertex has no well-defined neighbourhood, or when normals flip direction. Duplicated vertices at seams, T-junctions, zero-area triangles, and holes are the common culprits — all of which our repair step handles.

The repair uses manifold-3d, the same Google library that Autodesk Fusion 360 and Onshape use under the hood. For most common STL problems (vertex duplication, degenerate triangles, flipped normals) it matches Blender's 3D Print toolbox. Blender still wins for manual hole-filling on severely broken scans — where the mesh needs human judgement — but the one-click case covers ~90% of failed-to-slice STLs.

It welds coincident vertices within 1e-4 units and drops triangles that are either zero-area or near-collinear. For any mesh that was already clean, the output is geometrically identical. For broken meshes, the topological errors are fixed with minimal changes — no smoothing, no decimation, no hole-filling that invents new geometry.

You still get a welded-only result as a fallback — duplicated vertices are merged and the mesh is re-indexed, which fixes shading seams and many slicer warnings even if the topology still has open edges. The UI shows a warning badge so you know the result isn't a full manifold.

Yes. The pristine original is cached in memory, so the Restore button swaps it back instantly. You can repair, compare, and restore without reloading the file.