Bracket with a French cleat system

I've designed this robust Shelf Bracket with a French cleat system, which comes in sizes from 3 1/2 to 9 inches. I've been using my Bambu Lab P1S and A1 Mini to print these, and they've been reliable so far. I'm releasing this under public domain, so feel free to use, remix, or share it. I've uploaded Step files for each size.