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I'm not sure how useful this is to you but there is an OpenSCAD workbench for FreeCAD. [0] In theory you should be able to export STEP files via FreeCAD.

[0] https://wiki.freecadweb.org/OpenSCAD_Module

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While technically that works the resulting STEP files aren’t anymore useful than an STL. You can’t send them to a CNC machine.

Can't one use the Path Workbench in FreeCAD once an OpenSCAD file is imported?

For STLs there are a number of 3D CAM tools: MeshCAM, pyCAM, FreeMill, or importing the file into Autodesk Fusion 360 and using its CAM tools.

List of other options at: https://wiki.shapeoko.com/index.php/CAM#3D_2 and https://wiki.shapeoko.com/index.php/Commercial_Software#3D_C...

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