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Free draft angle checker

Check how your pattern’s faces meet the pull direction. The map separates the flat back, drafted faces, low draft, and negative faces.

Runs in your browser. Your file is never uploaded.

Your model

Drop an STL, OBJ, or 3MF here.

Up to 250 MB. All processing stays on your device.

Files stay on your device.

Options

Faces above it pull along the direction above. Faces below pull the opposite way.

Result

Choose a file or try the example.

How it works

  1. 1

    Load a pattern

    Try the example to see a flat back, vertical walls, drafted walls, and an undercut.

  2. 2

    Set the pull

    Choose an axis, your minimum angle, and a flat-back or split pattern.

  3. 3

    Review the map

    Orbit the model and compare area shares. Save the draft image or the report.

Area shares
The legend weights each class by triangle area, so fine tessellation does not dominate the result.
Local angles
This checks face normals. It does not detect every trapped face or prove that a mold will release.
Foundry review
Casting numbers are estimates. Ask your alloy supplier or investment maker for pour temperatures and burnout schedules.

Questions

What counts as an undercut?

A face with negative draft relative to the selected pull direction. A flat face on the lowest plane is treated as the parting face.

How does split mode work?

The split height is measured up from the lowest point of the model along the pull direction. Faces above it use the selected pull direction. Faces below it use the opposite direction. Triangles that cross the split are classified by their center, and faces lying flat on the split plane count as parting faces.

Is my file uploaded anywhere?

No. The conversion runs in your browser with the JavaScript on this page. Your data never leaves your computer, and nothing is kept after you close the tab.

Quoting castings or patterns every week?

I build quoting tools that read a customer's CAD file, work out weight and metal cost, and price the job automatically.

Ask about automating itSee custom software work

Source code and license

You can inspect the code and the licenses here. Models are parsed and measured on your device.