I gave it a try! I tried to get the odd-ball perfectly circular cut and square dimensions, but I'm mostly just eyeballing it. Haven't tried printing it yet, but

I gave it a try! I tried to get the odd-ball perfectly circular cut and square dimensions, but I'm mostly just eyeballing it. Haven't tried printing it yet, but I have some nice red filament that I think is going to look good! Here's a screenshot from inside FreeCAD: https://f.toi.sh/rubygem-screenshot.png https://f.toi.sh/rubygem-screenshot.png A nice manifold solid: https://f.toi.sh/rubygem.3mf https://f.toi.sh/rubygem.3mf / https://f.toi.sh/rubygem.stl https://f.toi.sh/rubygem.stl A terrifying non-manifold FreeCAD mess: (requires surface WB) https://f.toi.sh/rubygem.FCStd https://f.toi.sh/rubygem.FCStd