CR10 V2 Extruder Motor Knob  Geeetech
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CR-10 V2 Extruder Motor Knob + Geeetech

Extruder Knob which will work on the CR10 V2 maybe other printers ...

similar models —

CR-10 V2 Extruder Motor Knob + Geeetech alternatives
Extruder Knob
psdesign