I printed the remixed version of this headphone holder about a year ago. It can be found here: https://www.thingiverse.com/thing:3298490/remixes

It printed great with no problems and I love it. I've been able to clamp it on laptop tables and regular tables alike. But after a year of extended use, the bottom of the clamp base began to split from being tightened on tables. So I popped it into tinker cad and placed some supports in the area were it cracked.

To download the remaining pieces, go to the remix here: https://www.thingiverse.com/thing:3298490/remixes, this is the clamp base only that I had to fix.

Program: TinkerCad
Printer: Creality Ender 3 Pro
Filament: 1.75 PLA
Infil: 50% (The other pieces I only printed at 20%, but since this piece takes the load I made it denser.)
Layer height: .24
No rafts or supports needed.

If you can any questions please let me know!