Could the Z-axis mechanism be further simplified? What if we removed two of the four Z-rods so that the remaining two were diagonally opposite each other, would they provide all the stability that the bed requires? Preventing movements in the XY plane. And preventing the bed from tilting downwards? If there is a weakness in this configuration, I could imagine it might be that if you pushed down on an unsupported corner it might sink a little. So then, what if we moved the two lead screws and Z axis motors to those unsupported corners (such that they too are diagonally opposite each other)..... What do you think?