This is a known bug in the latest firmware (5.2) for UM3 and S5 and will be fixed soon. The recommended fix is to push the filament by hand for the second extruder (fortunately you only have to do XY Calibration once every few years when you get a new core, right?)
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pdzamore 1
Would it be possible to add "prime extruder 1" and "prime extruder 2" steps to the xy calibration routine? I often have the calibration fail because the UM S5 retracts the filament too far, so it tries to print when the filament is not at the end of the hot end. Moving the filament to prime the hot end before running the calibration does not help, as the retraction appears to be part of the routine itself. Thank you!
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