🔍 STL Analyzer & Fixer
Upload your STL file to analyze mesh quality, detect issues, and automatically repair common problems for perfect 3D printing.
📂
Drop STL File Here
or click to browse
Supports ASCII and Binary STL formats (max 50MB)
ℹ️ What This Tool Checks
✅ Mesh Quality
- Non-manifold edges (edges shared by more than 2 faces)
- Holes and gaps in the mesh
- Inverted normals (inside-out faces)
- Duplicate vertices and faces
- Degenerate triangles (zero area)
📐 Printability
- Model dimensions and volume
- Watertight status (closed mesh)
- Triangle count and complexity
- File size optimization
- Overall print readiness score
💡 Common Issues & Fixes
🔴 Non-Manifold Edges
Problem: Edges shared by more than 2 faces create unprintable geometry.
Fix: Auto-repair merges or removes problematic geometry.
🕳️ Holes in Mesh
Problem: Open boundaries make the model non-watertight.
Fix: Auto-repair fills holes and seals the mesh.
🔄 Inverted Normals
Problem: Inside-out faces confuse slicers.
Fix: Auto-repair flips face orientations for consistency.
📋 How to Use the STL Analyzer & Fixer
- Choose an STL file from your computer.
- Review the mesh quality report, which covers non-manifold edges, holes and inverted normals, plus its dimensions.
- Select Auto-Repair Mesh to fix common problems.
- Download the fixed STL and check it again in your slicer.
🎯 When to Use It
- Fixing a model that your slicer reports as having errors.
- Checking a downloaded model before a long print.
- Finding why a model prints with gaps or missing layers.
💡 Tips & Common Pitfalls
- Auto-repair handles common faults, but badly broken meshes may need manual work in a modelling tool.
- Always preview the repaired model in your slicer before printing.
- Check the dimensions the tool reports. STL files have no units, so a model may be scaled in inches rather than millimetres.
- Keep your original file in case the repair changes details you wanted.