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Printer - Stopping Printing

Hi, Our public library has a Lulzbot Taz 6 3D printer which just stops after it's been rpting for a while. The nozzle chases around on the bed but no filament comes out. Is there a part in the nozzle which needs replacing? We can see a divot on the filament where the nozzle seems to be trying to extrude the filament. It's as if it grabs the filament but doesn't extrude/spray the filament at a different point in different prints. Most of the time it prints fine but this has happened twice. We appreciate your thoughts/suggestions. If this is not the best forum to ask these kinds of hardware questions, can you please suggest a better forum fit (with a link to it? Thank you.

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