Well, currently there's not a day that goes by without me reading someone talking about 3D printing, 3D printers and whatnot. Also, I've been reading of how easy SketchUp is to work with, so given my failure to make anything of Blender around almost 10 years ago... I decided to give SketchUp a try.
Note: Newer designs are at the top (for chronological reading start at the bottom of the post)
02 - Second practical motivation: