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Visualization is actually one of the reasons I've been successful with my current project (creating a 3D modeling library which uses 3D tool representations and movement as afforded by G-code to write out G-code or DXFs) --- the tool which makes it possible is:

https://pythonscad.org/

Being able to just plot something and see the algorithm on-screen has been an incredible benison.

I'm hopeful OpenPythonSCAD will be merged into OpenSCAD presently.

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So you are working on a way to generate toolpath gcode from python? I need that.

I have a python workflow for my laser cutter, I can make a drawing with drawsvg and then cut it with lightburn.

I have used build123d to make 3d models in python but not yet found a way to generate toolpaths for my milling machine.

Yes.

Give the code a try!

https://github.com/WillAdams/gcodepreview

If you can describe a simple part I can work it up for you and add it to the examples.

EDIT: Alternately, try pyCAM, or Kiri:Moto w/ an STL?

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