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I am working with i3 Mega printer.
After more than a year printer sopped working as intended.
During the print filament stops flowing.
I did replace extruder and bowden from the spare set.
Stepper motor that feeds the filament starts to skip at some point.
Filament is perforated by the gear to the point when it breaks.
At the same time printer is reporting correct head temperature.
Printer finishes print successfully, at least it thinks so.
Print is half done and I can see that the filament was flowing slower and slower to the point when it stopped.

How to trouble shoot my problem, what can be the reason for it?