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You can do that effortlessly right in openscad itself or in freecad for a more visual way, or in every single cad app in existence I think.

In freecad you first just open the stl file, then Part -> Create part from mesh, then you have a solid you can modify.





Sounds great in theory until you actually try it and discover that anytime a STL touches another object the F6 render craps out with "Manifold conversion failed: NotManifold"

I just tried this in OpenSCAD and it crashed:

intersection() { import("3DBenchy.stl"); sphere(30); }


FYI, I just tested this in OpenSCAD version 2025.09.13 and it works fine.

Indeed it does. Looks like their recent dev builds are way better. Good to know.

Yeah you definitely want to use the dev builds for openscad



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