This is a very simple hook I designed to hang my original Prusa Mk3s spool holder under my enclosure so that it's at the ready for those times when I need to print without the enclosure.

It's pretty enough to use for many other things - perhaps hanging cups under a crockery shelf or even hanging a curtain if you are a bit careful about the load.

Print on its side without supports.  (I've deliberately chosen the “poor” side of the print in the photographs to demonstrate how it looks without support).

I've used standard Prusa Slicer settings 0.2mm QUALITY and a 0.4mm nozzle with PLA for this example.