Any idea what’s happening? My makerbot replicator gen 5 with a smart extruder keeps doing this

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Take the spool out of the printer and put on an external spool holder in front of the printer and make sure it turns freely then run a test print. If the same thing happens then it’s time to get a new nozzle.

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Check the diameter of the filament in several places over a long run to see how consistent it is.

What temps and slicer? Also I would contact makerbot to see what they say.