I had to make the hook a little bit wider to fit my headphones, so I remade the model following the original one with this little alteration; I also added an extra part at the bottom, a kind of rib to make everything stronger. I used PLA, printed with small supports for the rounded part.
It actually works and is greatly useful. Thanks for sharing!
This is a remix, here you find the original thing: https://www.thingiverse.com/thing:2689243
Wanhao Duplicator i3 V1
Printing time: about 1 hour and 40 minutes