A simple bracket. I made this to provide some extra support for a shelf. I have not load tested it, but it seems to be fairly strong. Since it is just a bracket, it can used for anything.

I apologize for using mixed units, I initially designed this with imperial units to match the rest of the shelf, but realized I needed to use metric screws because that was all I had. Hole sizes are 4mm and 4.6mm. The side meant to attach to the wall is slightly thicker, at ¼".

My print settings:

25% infill

0.2mm layer height

5 top/bottom layers

120% line width

4 walls