Headphone bracket for bookshelf

This is a bracket for hanging my headphones. It is sized to fit my European bookshelves, which have 20mm thick sides. I printed with 15% infill with the flat side down, no support needed.

There are 4 screw holes for convenience, but you only need to use two, or you can use a small C-clamp.

It's inside and away from heat sources, so I used PLA to print it.