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Recommended alternatives to SketchUp?
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I've not come across anything with that sort of free form, intuitive (for vector artists) control paradigm.
For functional modelling, I'd recommend a parametric app (like FreeCAD, as you've mentioned), though it can be a bit trickier to use. You may feel as if the workflow has some gaps compared to something like SolidWorks.
And I'm willing to learn FreeCAD, but it seems to be more program than I need for such a simple use case. I just need to be able to model basic rectangular prisms, maybe apply "difference" cutouts, and measure various pieces/voids.
Edit: typo
The only good free option for that is SolveSpace. Don't bother with FreeCAD. It still isn't usable. SolveSpace is remarkably good for an open source CAD program.
It does have some notable missing features though, e.g. no bevels, fillets, drafts, etc. and last time I used it it had accuracy issues with small holes. But for your use case it's probably fine.
Cool, I hadn't heard of that one. I'll give it a look!