Sorry! I see your post now. It fails at 3mm/sec. You have underextrusion problem. There are about 15 possible causes. Many of them shouldn't have changed since the printer was new. The most likely problems where something changed are:
1) clogged or partially clogged nozzle
2) tiny pieces of plastic in the Bowden causing it to be tight
3) Deformed isolator
4) Friction form filament at an angle or tangled filament
#3 is most likely
Testing #1 and #3 properly both require you to take the head completely apart.
Testing #2 is best done by sliding filament in and out of bowden with power off. Through the feeder. The feeder does not provide much resistance.
Testing #4 - simply put the filament on the floor so that the filament arrives at the feeder more vertically.
If you take the head apart, take the white teflon isolator and push some cold filament through it and check for resistance. Especially curved filament. Consider drilling the hole with 3mm drill. Consider ordering a new one (the new ones have glass fibers and are more resistant to deformation).
240C and hotter tend to deform the isolator over many weeks. I often print at 260C but try to avoid these temperatures if at all possible. Lower temperatures (210C) can possibly also deform the isolator. Especially if your temp sensor is inaccurate.
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simmonsstummer 0
i've always done it at 230°C....
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