Mesh Doctor for STL
Mesh Doctor checks a mesh for holes, non-manifold edges, degenerate faces and watertightness and marks every defect in the 3D viewport — hole boundary edges in red, non-manifold edges in orange.
Processing and data safety
Section titled “Processing and data safety”This tool runs entirely in your browser — your files are never uploaded to a server.
Input and output
Section titled “Input and output”- Formats: STL, OBJ, PLY, 3MF, GLB, GLTF
- Flow: Mesh → defect check with in-page 3D marking
How to use
Section titled “How to use”- Open a model.
- Review the diagnostics (holes, non-manifold, watertight) — hole boundary edges are drawn in red and non-manifold edges in orange on the 3D preview.
- Run the repair and download the STL.
Key details and limits
Section titled “Key details and limits”- Repair welds vertices by position, removes degenerate faces and unifies normals; it does not fill real holes.
- No complex hole filling or boolean rebuilds.
- Point-cloud inputs (.xyz/.pcd and faceless PLY) are rejected with a clear message — convert to a mesh format first.
Common use cases
Section titled “Common use cases”- Upload a mesh → review the report → repair and download STL