PatternLab Turns STL Surfaces Into Sewing Patterns

Field notes

The tool starts with an STL surface and lets users mark boundaries and darts before flattening selected regions into pattern pieces. Its stated workflow includes strain inspection, which addresses the distortions introduced when curved geometry becomes a flat cutting pattern. The page identifies a Three.js editor and local FastAPI geometry backend, and distributes ZIP packages for macOS and Windows. It is presented as free and open source, with voluntary coffee support rather than a required subscription or account.