I'm into the planning phase of the wiring on my new machine. It's got dual Y and dual Z axes, so 5 motors total. Since I'm using an Arduino Uno for control I've only got four motor outputs. I plan to split the signals from the Uno to one of the two dual axes but I'm no sure if it makes a difference which I should split. I've heard of issues splitting control signals (as opposed to using a dedicated slave circuit), if the motors get out of sync. I'm thinking that it would be better for that to happen on the Y axis than the Z, as there would be no weight issues to aggravate the problem. Any other opinions? Does it make a difference at all?