Mounting Mount Mounts Brackets M6 Shelf for attaching shelves onto walls

thingiverse

You can use this mount to hold anything up, such as a shelf on the wall. When you attach it with M6 screws, it should fit snugly in place. There are two files that mirror each other exactly, and for a small shelf on the wall, you'll need to print both of them. If they're printed with PETG, they should be strong enough to support your needs. Be sure not to use the same mount on both sides - always print one side first, then the other, or it may collapse easily under its own weight.