Howdy, here is yet another headphone holder.
I made it to suit my needs - mountable on the side of the desk and with flat curved surface so the precious cushion on the actual headphones won't get damaged any time soon.
Out of curiosity I've done some testing and this holder could withstand 50 Kg load just fine. Only when I (70 Kg) hanged on it and started doing a pull up it cracked.
I printed with 0.2 layer height and no supports were needed.
The author hasn't provided the model origin yet.