Yep Andy - meant between the AXBB-E and driver!
Some more progress on the physical build - ballscrew covers are on and work as planned! and most of gantry done. Next is to tackle the motor mounts. Plan is to use the long 35mm shaft length to go through the mount without having to hand route out a pocket as others have.
I also managed to connect 4 steppers and get them moving via UCCNC with nothing going pop, so know electronics for movement in place.

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Reading Jazz's post elsewhere I realise I may have been confusing the X and Y axis all this time.oops. So stranding directly in front of the machine, I was calling left to right movement across the gantry Y and front to back X. So I have configured the dual ballscrew axis as X in UCCNC,
Reconfigure is just in software so OK, but can someone confirm I have been wrong, and X should be right to left (as per graph axis) and Y is dual axis. Probably good to know for a CNC machine:)

I'm also worried about the stand/table, When you put a decent force in the middle of the ply it flexes perhaps a couple of mm.
Initially I just needed somewhere to build it and didn't put lots of thought into the stand, thinking the machine frame will maintain it's structure. It's a wooden bench with ply top, I can do a fair amount to strengthen it up but - is this going to be a major sticking point? I see plenty of "desktop" type commercial machines out there which I assume people just stick on a workbench etc?
Really don't want to start having to get a frame welded if I can help it ! Ideas?

Thanks