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This is what four+ years of everyday running can do to an extruder steppers pinion gear. I really don't know how it was still even feeding filament like this but it was starting to make some funny noises so I though I should probably take a peak inside. I find it a little weird that it only uses the tip of the gear but it wouldn't be the first time I had a gear slip down the shaft on one of these. Overall I'm surprised it's held up this long ... it's not a bad idea to check these things for wear and tear now and then.
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