Hi Everyone!

I have a newbie problem in my hands and don't know how to tackle it. After I finish the assembly of the machine (Prusa mendel I3) I went ahead and print a calibration cube (2x2x2) but when the printing was done I end up with cube with half of the structure shifted to one side, I thought it was a first print error so I print it again and the result was a half cube with the same mistake only shifted to the other side. What it could possibly be causing this error?

I've already have the machine calibrated (bed, Z axis, extruder, the whole shabang)

Attachments:

Complete cube: First print - Shifted Right
Half cube: second print - Shifted Left


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