HI Nophead,
After some more testing, I have found that it is the X-axis that is consistantly 1mm short. When I print 10mm hollow cube, one side is 9mm the other is 10. When I print the 40mm cube, one side is 39mm the other is 40mm.
I will try and adjust my stepper pots to make sure I'm not skipping steps on the x.
Thanks,
Aras