i have try with and without fan.
tightening and loose the screw on the extruder tensioner.
try print with different temperatures with the printhead as well with the platform.
nothing helps, my ultimaker is more broken than drive :(
i try to order a new part for the one is broken on my extruder at ultimaker.
the thing that i will ask, is it normal that there is a FLASHING red led (see picture #1) on the board when the printer drive.
because the other led (see picture #3) is only burn red not flashing.
gr 5 your right the temperature drop was a result about the fan start.
i have try the same print without fan and now the temperature line is smooth at 220 degrees.
but the problem isn't solve, now i think the problem is in the feeder.
a month earlier i have crush the feeder part maybe my bolt was too long.
do you think it make sense if it is broken or not? in mine opinion not the nut stay also with a broken part in place.
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