Did you know there is another type of ethernet cable?
These Flat cables are great for carrying around.
Unfortunately, you have to keep them in rolls for sake of saving space in your bag.
This design is for flat ethernet cables with a length of 4 meters.

This thing has to be printed with support!
I tested it with PLA on a modded Anet A8 printer.

PS: Did you notice that the file looks different from the picture? I used the fillet function of my cad tool (OnShape) make it a bit prettier, but the relevant parts are unchanged.