Hi! I’ve been printing on minis for 5 months now, and I love them! I’m up to 3 minis now, but my third one is presenting with a puzzling issue.
At the start of every print, I have to remove the filament and snip off the final half inch or so of filament. It looks like the filament is not being retracted enough, and is left in a hot section of the hot end to pool, until it forms what I would say is a 3.5 or 4mm plug that will not move through the hot end at all. After I snip this slightly thicker tip off the filament, the printer runs perfectly. If I don’t remember to snip the end of the filament, the plunger is unable to force the filament through the hot end. In fact, when at melting temps I cannot even force the filament through with my hand.
My other two minis have never had this problem. What could be causing this third mini to create filament plugs after every print that have to be snipped off? What can I do to fix it? I’m reasonably familiar with the individual components of the hot end assembly and carriage, and I’m not at all averse to taking it apart.