Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:616027.
This is a great way to hang up your headphones on the wall. A neat skull design and made so that you can make different parts different colors as you like. Everything should be able to be pressed into place. I left about 0.2mm of space around every side of the pieces that are supposed to go into place so the fit may be loose or tight depending on your printer/filament.
After putting this together I did notice one slight design flaw, there isn't really a way to take it back off. If I need to I'll probably just drill out some holes to get at the screws, but I'm also planning on doing a slight redesign to make those accessible without needing to figure out how to take the other parts off.
Hope you enjoy.
Update:
I added updated versions of the inner color and design portions of the files so that they now include some decent sized holes that you can get screws into and out of. Now you can glue all the parts together and not have to worry about it being stuck to your wall forever. ;) There were only two files changed, the new files are HolderInnerV2.stl and HolderDesignv2.stl. I left the old files up just in case you want to use those instead.