despite the fact that I need to manually push the filament with current 5.2.8 firmware on my UM3, I just tried the following :
doing 2 X/Y calibration patterns in a row. I mean : I did one calibration pattern, up to the end, entering the X/Y offset values, and immediatly did a second one (after cleaning the glass plate).
I ended up with 2 very different set of values :
X:5 / Y -7 the first time
X : -5 / Y : - 17 the second time
What could be wrong here ? Nothing changd bet