This is an updated version of my last cable comb. After some critiques from @heyitsdubblea I went back to this and added screw holes so that you can screw this into a wall. I also knocked down the edges a bit with it. 

I also have attached a version built around using a Command Strip incase you don't want to leave marks on your wall. 

Print Suggestions:

• If you get an error in Prusa Slicer saying “The dimensions of the object from file X seems to be defined in meters…” Don't worry, they are to the correct scale. Just select yes.
• Print settings: 0.20mm
• Supports: None
  infill: 15%

There are two slightly larger Ethernet positions on one side. Try that if you are having issues with the Ethernet position being slightly too small.