While working on a present for my son (Thing will be posted soon) this was a failed iteration of one of the parts that happens to be useful so I figured I would share it.
Basically it is a base so that you can use those old DVD and video game cases for something rather than gathering dust... (my DVDs live in binders now for storage, I use PLEX). By adding two of the 20mm braces, or the 125mm base, you turn an old case into a nearly indestructable photo/picture frame for your child's room... and they are pretty hard to tip over... a nerf dart can't tip over the base shot from 3 feet away. (a hint about the upcoming project) and barely can tip one over with the two 20mm braces.
So you can declutter your entertainment shelves and decorate your kid's rooms without hurting the environment :)
Adjust at your whim... probably could go with 0% infill