Has to be put together in a particular order. Watch a utube video. Mine came with washers installed on top & bottom of the slave gear(the one not on stepper shaft) so it will not grind against holder and will stay centered on passthru hole. So nice to initiate a filament load on my Ender 3 V2 and it pulls the filament right thru the extruder and into the boden tube. You will have to change the Steps/Extruder value from 93(stock) to 139. I am running Jyers firmware. Much more accurate feeding of filament.
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