Can you send a photo of your extruder?
Normally, I would say tighten the tension screw but we would have to see what kind of extruder you’re using.
You may check for the correct thermistor is set:
sensor_type: ATC Semitec 104NT-4-R025H42G
Prusa has a guide on how to tension the extruder.
The stock Prusa extruder is pretty good. I only switched because I wanted a toolhead board, filament cutter, etc. Changing the extruder likely won’t help much.
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I bought the printer before the Pandemic. Never had issue due to the Idler screw. If the problems mentioned here are caused by it, don’t know why all of a sudden it has such a big negative impact. Any idea?
The screw could have come loose or the extruder assembly has worn out (which leads to idler screw issues).
Have you looked at this video:
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