But, as far as I can tell, it's remarkably difficult if not impossible to set the dimensions of each new feature relative to each other beyond clumsily clicking and dragging them around, or some basic "snap together" functions. Generally, I get that most of them let you create 3D shape primitives (rectangular prisms, cylinders etc) and set their dimensions. I've tried Autodesk 123D Design, TinkerCAD, and Google Sketchup - and the result is that I just get immediately infuriated at (what I perceive as) the very limited functionality of these programs. Recently I tried to pick up using a free consumer CAD program for use with my home 3D printer. I have ~7 years of experience using Solidworks.
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