Recommend a short exercise of all the pertinent functions. Verify fans work, verify bed heat works, verify head heat works, verify temp control works, verify.... other stuff?
When I first tried this on my printer it made terrible grinding sounds. I verified all of my motor connections and they were correct. Upon plugging them back in I found that they weren't very good fits into the RAMBo board and really pressed down on them to seat them well. That solved the issue. Calibration worked the next time. I'm going to look into replacing the connectors on the ends of the motors, but for now people should be aware that they have to verify these connectors are seated very, very well.
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