This is a remix from mistertech headphone clamp for screw mount/doublesided tape. Should be wide enough for most common headphone (about 45 mm). I used 4 mm wood screws, 16 mm long with flat top.
Be careful when screwing in, you might damage your print (especially with low infill).
I used 15 % infill, which is fine for the headphones, but easily cracks when screwing too tight.
The v2 versions have a longer back at the cable holder, so hopefully it won't fall out that easily.
Remixed from https://www.thingiverse.com/thing:2076034/files
The author remixed this model.