STL Analyzer & Repair
Upload a binary STL file to check its triangle count, bounding box dimensions, and detect common mesh problems like degenerate triangles that can cause slicer errors.
Upload STL
Drop your .stl file here
or click to browse — binary STL only, processed locally in your browser
STL Analysis
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triangles
Common STL Issues
| Issue | Effect | Fix |
|---|---|---|
| Non-manifold edges | Slicer creates holes or missing walls | Meshmixer Repair, Netfabb, or PrusaSlicer auto-repair |
| Inverted normals | Slicer sees "inside-out" geometry | Flip normals in Meshmixer or Blender |
| Degenerate triangles | Zero-area triangles cause math errors | Remesh or clean up in CAD software |
| Intersecting geometry | Unpredictable slicing behavior | Boolean union in CAD / Blender |
| Too many triangles | Slow slicing, large file | Decimate mesh in Meshmixer or Blender |