A small shelf bracket about 3in tall.
Sized to fit a .75x3.5in board for use as a shelf without showing on the front. A screw driver can fit inside to easily tighten the screws.
I used this to make a small shelf over my bathroom sink and underneath the mirror. I don't expect it to hold much weight, but it will hold the board, my glasses, and other small items.
3d solutech PLA
Print on side with support in holes