Thats great news, a set of Hiwin bearings and rails are in my future then. The controller has a flakey TA8435HQ chip that crowbars the current after about 20mins. I tried adding extra cooling but it carries on doing the same. Since this chip is now obsolete and to be frank the rest of the board design is pretty pants I figured its time to buy/build something better.

At some point the delrin bearings in the gantry are going to need replacement and this looks like being accomplished with external split nuts attached to the bearing sleeves. This machine was cutting carbon fibre helicopter frames prior to me getting it, so it's not had an easy life.