The original plastic extruder was constantly unstable. The pinion and bearing worked fine from time to time, but the finished prints consistently showed signs of under-extrusion, and from time to time I noticed the bearing would stall completely while the pinion was moving. I've carefully leveled the bed, cleaned the hot-end hole, changed the nozzle, and tried adjusting the extruder's spring tension with various shim configurations, but nothing has produced consistent results. Simply replacing a cheap plastic extruder with this aluminum extruder has changed day and night. I can finally admire what the CR-10 is capable of.
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