Twoo STEP CAD Toolbox: free offline tool converts meshes and photos to editable STEP solids

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Twoo STEP CAD Toolbox is a free, source-available solid conversion tool for non-commercial use, licensed under PolyForm Noncommercial 1.0.0. It turns STL meshes, hardpoint STL files, OpenSCAD models and photos of flat parts into editable STEP solids, working offline on Linux, macOS and Windows. The project is the long-term-support successor to STL2STEP, and it bundles modules for mesh conversion, OpenSCAD rebuilding, cleaning existing STEP files and image tracing. It runs in a web browser from a single portable folder, and the developers note that converted files should be checked before being relied upon.

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