Summary

ceiling mounted harmonica style tension release for headphone cable. If you move around the room a lot and need a long cable, then it might start to tangle around things which is very annoying and potentialy dangerous for your equipment. With this gadget you can hook the 5m cable on the ceiling and have it run back down to you from above, no more tangling.
Just drill two small holes in the ceiling matching with the model, hammer in some drywall anchors and screw it in. route the cable through the loop at the tip of harmonica.

If you tug at the cable, it will gently spring back, it stretches for about 20cm so even if the cable catches on something, you wont damage your headphones

I printed mine with abs and it's been working fine for months with no yielding or cracking
I would avoid PLA as it's too stiff and brittle
Ideal material would probably be PETG