Well I have noticed that most seem to want a more ridgid z axis but there is a support problem what do you guys think about having a Z assy that is ridgit and does not move and fixed at a set height then to move the Z axis assy up and down you move the whole X axis up and down on the gantry supports? This would pose the problem of 2 screws and either 2 motors or ? well please give feed back.