Was working perfectly well for a number of prints, then I powered it back up to print something and the Z axis was out of calibration. I tried recalibrating and noticed that the Z-axis was sort of "dancing" -- stuttering on the first slow motion, then catching up to relevel the axis (sort of) but still losing ground against the other side. I swapped the stepper connections and the problem is only on the left-side stepper. Also, I can move the left-side stepper lead screw with my fingers and slight force which I can't with the right. Just got this printer last week -- am really disappointed its failed this fast.