I have one of the new rigidbots and have assembled it. I've got a problem though. When the z axis homes, when the carriage hits the endstop, the z motor on that side advances a little more and then bounces back "up" slightly. The other z motor stops completely as soon as the end stop is triggered. As a result, my carriage goes off of true (becoming canted) ever time it homes. When it does this, it binds up and the screw on the motor opposite the end stop is no longer able to turn, being bound up.
I sent mail to customer support but, a week later, I have no replies (or even acknowledgement of the email). Any suggestions on how to fix this so that both z motors behave identically and my carriage doesn't bind up?