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 Oooh, figured out what went wrong. The arm holding the roller bearing doesn't center the roller bearing on the drive gear. Therefore, after printing awhile, it will randomly make a "snap!" sound. That's the sound of the filament popping out of the grip of the spring loaded arm. To center the arm holding the drive gear, insert one plastic washer and one brass washer. Use the washers that came with the delrin plunger.

Man! after 18 days, I FINALLY fixed my Replicator!!! It is printing beautifully!

Yay :0)