Wrench & Nut shelf bracket

For printing, lay nut face down. I'd suggest blocking any supports going into nut threads, and using tree.

Versions 1-4 can be mirrored if needed. Version 5 uses same for both.

For Versions 1-3, Print with (or glue on after) the Tops for better contact with shelf.

Just screw/drill shelf into the tops if needed. I did not add any. The added mounting holes for the wall should be obvious.

The photo of the printed example is an early (and very large) version with my nickname on it.