This is a small project I started this weekend to organize my (mostly USB) cables better. I already had a similar rack made from metal, but figured 3D printing is a thing now, so...

The design tries to minimize on plastic by supporting each "finger" with two thin walls, allowing you to print without supports. I strongly suggest you print it with the back on the plate, as it gives much better adhesion. (Printing with the "fingers" flat on the bed, prints faster but I had severe difficulties having all the 24 thin walls to stick properly to the bed, YMMV)

The Fusion 360 design is parameterized for the number of fingers and screws.