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It's all I've got for now. I'll replace it at some point soon.
All switches are NC so if I get a break I'll know about it.

As for 4 core from Igus:...

Coloured cables will be expensive and not easy to find in UK, plus they all do the same job so save your money and spend it in areas which will make the machine better.

You don't give any details...

4 core CY 1mm cable will be fine.

IGUS uk
https://www.igus.co.uk/chainflex/unharnessed-cable