A comparison of the CAD tools hobbyists actually reach for — Fusion 360, FreeCAD, Onshape, Plasticity, and Tinkercad — covering the parametric-versus-direct-modeling divide and which one fits the part you're trying to design.
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CAD for 3D Printing: Fusion 360, FreeCAD, Onshape, Plasticity Compared -
Functional 3D Printing Design Rules Design rules for 3D-printed parts that have to work, not just look good — designing around layer-adhesion anisotropy, and the practical rules for clips, threads, living hinges, press-fits, and load-bearing geometry.