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I tried learning #Blender to model the HDMI + Ethernet bracket from scratch, but after a while I realized that a 3D modeler used modtly by animators doesn't make a good #CAD for mechanical design.

Now I'm following a bunch of beginner's tutorials for #FreeCAD. Typically, you'd start by drawing a flat XY sketch and later extrude it along the Z axis.

Parametric CADs let you specify constraints on the sizes, distances and angles between certain lines, which can be adjusted at any time.