A Remix of rhodeseng's Cable Chain, but using a 1.75mm Filament as the pin so you can just insert and cut pieces of filament to work a pin. Because the pin's fixed I have it unsupported for long distances with no sag.

Using under my desk to support a few USB cables horizontally for a pull-out keyboard tray. About 2 feet of unsupported length. Other cable chains I used it would unclip.

Be careful though, of the hole, It's exactly 1.75mm so you may need to adjust your print setting a bit if it doesn't fit.