What type of wire to connect stepers

Almost anything will work. It doesn't need to be shielded for the stepper motors, but it might help to reduce radiated noise to the other components.

If the wire runs in a drag-chain you might want to consider flexibility. Oil resistance might be important too (coolant can basically be considered the same as oil, I think). In that case consider Ölflex

Rapid sell it by the meter. www.rapidonline.com/drag-chain-cable.

gizmo6023 wrote:

Thank you both for the information, I hope shipping from the UK is reasonable.

Where are you based? There has to be a local supplier.

You can even order directly from Lapp here:
lapplimited.lappgroup.com/products/onlin...-classic-fd-810.html

It defaults to 50m, but let me select a different length (10m) and wanted £16 for it. Then I needed to create an account, so stopped experimenting.

You could even try eBay. You quite often see the remainders of full reels being old there.
www.ebay.com/itm/Lapp-Kabel-OLFLEX-Oil-R...6:g:aKIAAOxyu1BTk2bi
As an example.

gizmo6023 wrote:

California UAS

where does the Lapp Group link take you? I ended up at a UK site, but I think that was the system being clever.

There must be sources closer to your half of the world than Rapid Electronics, but it might be worth pricing up an order and delivery just because you have already found them.