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How to Clean the "Hobbed" Feed Bolt on a Lulzbot 3D Printer - IT-Works 3D Print
If your 3D printer filament is not feeding correctly, or you hear clicking coming from the extruder, the ridged feed bolt “hobbed bolt” may have plastic fragments wedged into its ridges that push the filament into the extruder, and may need to be cleaned. This short video shows you how to clean the hobbed bolt …