Hi,

I have put together my Prusa, and I tried to play with it. When I connect only one Z motor to control board, everything works fine, but when I connect both Z motors, it won't move. What's wrong? I have connected just like shown here: [reprap.org]

Do you think that maybe two springs used to connect X axis to Z axis are to to stiff and when it comes to one motor it is ok, but when it comes to two then force to overcome to move it is too big?

You get half the current, hence half the torque, in each motor when you wire them in parallel. You either have to wind up the current to compensate, or wire them in series instead.

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[www.hydraraptor.blogspot.com]