Stepper motor 42-40 with a 7 mm widebrass gear mounted on the shaft, acting as a knurl. Used in the extruders of the following Creality 3D printer models: CR-10 S5, CR-10 V2, CR20, Ender-3, Ender 3 Max Neo, Ender-3 Pro, Ender-5 Plus, Ender-5, Ender-5 Pro.
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