A simple cable coiling utility I made originally for my Macbook usb-c cable. Since it's a thick and hard cable, coiling it too tight or sharp damages the cable over time, outer insulation breaks.
I also printed %65 scaled version for headphone and usb charging cables, %50 scaled version for single-ear piece PS4 dualshock headphone.
Red one in the photos is the %100 (original) scaled version for Macbook charger cable.
I left one side open in case you need to push odd sized ends of the cable through or simply align mic/vol adjust section of your headphones in that segment before coiling over.
Some of my cables come with velcros, so for the open side I can also use the short velcro for fastening it tighter.
If you have a really long cable you could also coil around the handle through center (none can be seen in the photos.)
Cable straining holes could be deeper or the cover could be longer but each to their own. Including FreeCAD design if you wish to alter it.
%5-10 support density
%40 infill density.
Layer height 0.20 or lower else you might not see the fillet. (Like Gold one which is 0.28)
XY and Z distance for support would depend on your material. If it's PLA it won't be difficult to break usually.