I got bunch of these little boxes with fasteners, shrink tubes, random electronics and they always seem to get in a way as the one I need somehow always ends up on the bottom of a stack so I thought I will start plastering them over the walls of my built in cupboard and at first I wanted to make a set of hooks to fit all their random slots for the ones that have some but then I decided to go with making just a little loop to glue on the box and use whatever hooks I wanted.

I made them sort of squarish at first as most hooks to print you find around have flat top anyways but added a rounded versions as well now. 

Lastly I use 5 minute epoxy to stick them to the box and then even tho it is probably unnecessary I stab them through twice with soldering iron just for peace of my mind. 

I would say fibre filled filament like wood pla or cf pla would be best to use with epoxy but I used regular pla and even after a week and use on some heavier boxes they all seem fine.