Filament Jam/Clog
A filament clog/jam can happen and this will prevent consistent extrusion at best and completely block plastic from extruding at worst. It can happen due to multiple reasons.
This article covers in detail filament jams and clogs and how to deal with them:
Heat creep is a phenomenon where the filament path before the melting zone heats up more than it should. This tends to make the filament expand too much and cause a clog. Read more about it here:
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