Worth noting: TinkerCAD is capable of parametric modeling in "CodeBlocks" mode. I prefer writing OpenSCAD (by hand, rather than via a warmed-over markov chain),

Worth noting: TinkerCAD is capable of parametric modeling in "CodeBlocks" mode. I prefer writing OpenSCAD (by hand, rather than via a warmed-over markov chain), but having the option within something as inviting as TinkerCAD seems great for beginners.