here is a dropbox video (~5mb) of the machine doing an autohome, and then trying to start the part. https://dl.dropboxusercontent.com/u/4115151/test.mp4 I'm using a fresh install of Cura and I'm using the default marlin firmware. The aprt I've tried printing is the default robot as well as a small superman logo. Does the same thing on both.
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Dim3nsioneer 557
Quite a strange behaviour... a video indeed might help to get a better understanding. However, you already did some important checks. Sounds as if mechanics (motor and end switches) are fine.
Which slicer did you use for gcode generation? Do you use the default firmware or a custom version?
As a shot in the dark, it sounds to me as some strange gcode problem with a missing z-coordinate for the first print command.
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