Headphone Shelf Hanger

I needed a thing to rest my headset on to clear up my deskspace. This seems to fit the bill!

The gap is sized to match the 2cm thickness of my particular shelves, but the screw should extend that to fit 1.25cm thickness if need be.

My big breakthrough was figuring out how to print it without excessive supports - the accompanying CURA screengrabs show what I learned:
Print it up on end.
My Ender 3 with customized fan shroud can bridge the more shallow overhangs and screw holes, so I put a couple of CURA support blockers on two key points, and I'm down to only one tree support from the build plate.

A drop of Shoe Goo (let it dry) or an adhesive rubber disc on the end of the screw, and it grips rather well.