Handle that can be added to a used filament spool to allow you to easily wind/unwind cables for setup and tear down. A 1kg filament spool will hold 100' of ethernet if wound moderately tightly.

Drill a hole in the filament spool large enough for one end of the cable to slide through if you do not need to unwind the entire length every time. Secure the cap to the end of the handle using a screw or superglue to prevent the spool from falling off the handle.

I printed these at 5% infill and they seem to work fine. Modeled in fusion 260.

edit: added a knob to help spool things back up easier. Attach to the outer rim of the spool.