Thin Wall Checker
Upload an STL or OBJ to find walls thinner than 0.8 mm — the FDM minimum — with a color-coded 3D view and a downloadable wall-thickened fix that keeps your model's overall dimensions.
Drop your STL or OBJ file here, or click to browse
Up to 100 MB — processed entirely in your browser
How It Works
Upload your model
Drop an STL or OBJ file. Processed entirely in your browser — nothing leaves your device.
See thin walls in 3D
A color-coded 3D view highlights problem areas: red = too thin, orange = borderline, green = safe.
Download the fix
If thin walls are found, download a thickened STL where only the thin-wall vertices are offset outward — your model's overall size stays the same.
Why 0.8 mm?
FDM
0.8 mm
Nozzle is usually 0.4 mm — minimum 2 perimeter passes
SLA / Resin
0.5 mm
Thinner layers possible but fragile
SLS
0.7 mm
Powder sintering — thin walls may break during powder removal
This tool uses the 0.8 mm threshold suited for FDM, the most common printing technology.
🔒 Your file is processed locally in your browser — nothing is sent to our servers.