This is a remix of another hook / headphone hanger for the Ikea Boaxel shelf and rail system.
The original attachment to the Boaxel rails, never worked for me so I remixed it with another part for better and more secure attachment.

Remix of:
https://www.thingiverse.com/thing:5942332
https://www.printables.com/model/1413700-ikea-boaxel-hook