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A comment on Build123d: A Python CAD programming library. Parent comment

Re:Build123d: A Python CAD programming library by rao-v on Monday March 30, 2026 @09:26PM (#47581710)
Wait to usefully import and export STEP you need to be BREP based right? I thought SCAD’s engine was fundamentally incompatible (only really one open source BREP engine out there - OpenCascade)
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Re:Build123d: A Python CAD programming library by Cargo4286 on Monday March 30, 2026 @10:01PM (#47581917)
Yes, AFAIK you are correct that SCAD is incapable of outputting clean STEP files.
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Re:Build123d: A Python CAD programming library by WillAdams on Tuesday March 31, 2026 @06:47AM (#47585402)
Pretty much, that's why for DXF export I rolled my own:

https://github.com/WillAdams/gcodepreview/blob/main/dxfexpor...

(shows a DXF w/ arcs)

https://github.com/WillAdams/gcodepreview/blob/main/gcpdxf.p...

(shows a .py file for making DXFs)

See the PDF at the top level for more information.

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