I originally wanted to create an entire printable shelf, but figured I could use less material this way. It also enables you to construct custom (as in not strictly a grid) shelves.
I just hot-glued 12 together and it works surprisingly well. In the future, I'll probably screw them into some sort of backing for mounting. For now, I'ma just command strip it to the wall as is.
Features:
6x on a Prusa Mini with a 0.8 nozzle: ~2.5 hours (PLA)
The author hasn't provided the model origin yet.