Upgraded version here, 4-6U heights and uses less material.

Simple Gridfinity cable organizer that helps you keep your cables nice and tidy. Insert the cable in the slot and wrap the cable and secure the other end of the cable and you are done. 

You can easily see what end of the USB cable that is wrapped if you have a bunch of different cables in the same drawer, just keep the interesting end at the top of the wrap.

It's uses 2x1 grid for one cable. 

The cable holder is 37.2mm high, that is somewhere between 4-5u. Sorry about the weird dimension. I have a new updated version that can be downloaded in 4-6u heights.