Walled mounted headphone holder with shelf and hook.
Shelf can handle at least 4kg of weight, but I don't recommend to put heavy objects on it.
It's mounted by two screws, probably it's possible to use strong double sided tape but I don't recommend that.
Dimension of the shelf: 234mm x 100mm
I recommend at least 0.8 mm thick shell and 20% infill. Also I printed this in 45° angle because it didn't fit on my printer bed. Adding 100% infill around where screws will be can improve strength. No supports needed.