Ethernet Cable Combs based on muzz64's cablemanager_ethernet.stl. Created a variety of sizes (sorry, not parametric) and notched the sides to prevent slippage of a zip tie or velcro. If you want something bigger than 16 cables, you probably need to go with a round comb rather than this linear style.
All STLs were run through Netfabb Cloud to ensure validity and printability. Additionally, the notches in the sides were designed to avoid 90 degree overhangs, so you should be able to print these without any support.
I've been looking for a while for cable comb designs that provided both organization and security (as in, the cabling is secure and not easily pulled out under strain). I really didn't find any, except for the round style, which are far too big for my needs. I liked the minimalistic simplicity of muzz64's design, which elegantly lent itself to cloning and extension. The notches were simply hexagons rotated so that the long flat edge was parallel to the edge of the clip, and subtractively merged in by 1mm.