These printable TPU cable combs are still a work in progress, but because of how many people have asked about them I am posting the link to the CAD anyway. They are sized for 10AWG wire and intended to be printed laying flat out of high durometer TPU. The covers are meant to be printed standing up out of rigid plastic such as PLA+ or PETG. The ones with holes are designed to mount with #10 screws or 3/16 rivets. Some of the hole spacings are a little weird to accommodate mounting at an angle on a .5 inch grid.
Onshape: