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Extruder Not Extruding Filament? - 12 years ago

Hello, This is my first 3d printer. I built the Prusa v2 from a makerfarm kit (excellent kit by the way). It uses greg's extruder. I am having some problems, where the hobbed bolt starts slipping, and begins to grind down on the filament until it breaks it off. I believe the hobbed bolt is of good quality after comparing it to other hobbed bolts I searched on the forums. I tried playing with t