Headphone Holder, side mount

I have a shelf and minimal space, and wanted to mount my headphones on the side of it. Unfortunately I couldn't find a suitable side mounted hook/mount so I made this. Clamps on the side of a shelf and presents minimal impact to the capacity of the shelf. I put the screw hole in both sides of the clamp so it could be screwed from either side.I printed this, with minimal support, as shown in the picture. Seems to be strong enough. However it might be an idea to turn it on its side to take advantage of the laminar strength horizontally to the shelf.