I have the cable organizers from squinn (https://www.printables.com/model/564262-portable-cable-organizer-winder) laying around by the outlet. I wanted it to get a little bit more organized. With the cable winder organizer they are neatly arranged. 

There are 3 versions, small, medium and large. Just like the cable winder itself. 
There are also 2 versions for the first and last one, so they don't have a dovetail showing.

I printed it in PLA, bottom down, no supports.