Hi reprappers!
I have a Prusa i3 with a Melzi board. I have just customized my printer: I replaced the right Z motor with a threaded rod, and connected it to the remaining left Z motor with a timing belt. I have the following problem with it: All my other motors (X, Y, and E) are locked after they were moved by the controller (I cannot rotate them by hand), but not the Z motor. I tought the cause was the two motors connected paralelly to one output, but it is still exists with only one motor. If I switch Z and X motors on the board, then the Z is locked and the X is not. How can I make the controller to lock the Z motor after movement? I am afraid, the carriage descends a bit from the shakes and sudden movements.
Thank you for your help in advance!