I found this awesome project that I had to tweak a little bit to fit my smaller size printer, but I found this project on Thingiverse. It works very well and the print came out awesome! Check out my video below to see me printing it, also under the video is the file to download the headphone holder itself so you can print it out!
(You may need to heat up and melt the end of the plastic bolt as well as the socket that the bolt fits into and then try screwing it in, as this is what I had to do to make it fit better)
DOWNLOAD ZIP FILE WITH FILES IN IT HERE —-> Headphones Holder Rack