Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4012319.

Here's my take on a cord keeper. I was inspired by a bunch of other designs, but I think this one: https://www.thingiverse.com/thing:282266 was my biggest inspiration.

I created this from the ground up to allow me to resize it for super long cords of various types.

It also includes friction fit end clips that provides a simple way to keep cords from unwinding. They may need to be adjusted for your printer tolerances.

At about 6" (150mm) long the design is specifically useful for 10+ long cords.