this post was submitted on 07 Dec 2025
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FreeCAD

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Your own 3D parametric modeler.

www.freecad.org

FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.

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https://www.youtube.com/watch?v=bzf1yP6HUmY

I'm getting errors trying to create a pocket (2:25) because one of the edges of the inner rectangle is right on top of the outer rectangle, and I can't select just the inner rectangle

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[–] j4k3@piefed.world 2 points 11 hours ago

Not enough info and I'm about to go to bed. Easiest is delete and start again. You need to constrain geometry better than tutorials tend to show. I have never seen someone show proper topological design in tutorials either.

The main issue in cad is always π. When there are problems, think about where π is potentially being truncated to constrain a vertex. All geometry in cad is built sequentially