20mm Extrusion cable chain - Small bend radius - Minimal twist

Wanted a self-designed cable chain for my C-Bot clone. The others seem to not match the very popular "igus" cable chain style, where the joints are showing externally, rather than internally.

I like to see the gubbins!

- Walls are approx 2mm thick (give or take for tolerances)
- Lots of access to cable to rearrange or help feed cables through the chain
- Small guide around the circular insert to cut a groove into the mating plastic chain link. Makes movement a bit easier, whilst restrict