Quote Originally Posted by biketrialsdave View Post
Thanks for all the feedback guys. I think I'll go with Hiwin 20mm for the Z axis. What would be the "minimum" recommended centre distance between the two rails? I want to keep this as small as possible to maximise the effective Y axis length but without compromising rigidity. At the moment my whole Z axis assembly is 130mm wide..
Well generally I always suggest 250mm minimum, obviously this harder to achieve on smaller machine with smaller z assembles...

.Me