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WINSINN Dual Gear Extruder, Works with Creality Ender 3 CR10 CR-10 Pro CR-10S Tornado Upgraded Aluminum Drive Feed for 3D Printer 1.75mm Filament

New Double Gear Extrusion Mechanism. Had to change the extruder e-steps from 100 to 139 UPGRADE: Perfect replacement for Creality 3D Printers CR-10/ CR-10S/ CR-10S Pro/ Ender 3/ Tornado, etc. All-metal aluminum alloy, High quality dual gear extrusion, stable and durable. For 1.75mm Filament.  This Kit NOT include the stepper motor and instruction manual, we need to DIY :)   Some customers encountered gear wear problems. The solution is: Because the filament is forced to be centered in both drive gear grooves, the idler drive gear (the one not attached to the motor) is positioned on it's shaft by the motor drive dear. So, to center the idler drive gear properly, my suggestion for setting the unit up is as follows: 1) Assemble everything but do not lock the motor drive gear to the shaft. 2) Using a couple pieces of paper, shim the idler drive gear in the center of its bracket. 3) Clamp a piece of filament in the drive grooves and turn the motor a few turns. This should locate the motor drive gear in the correct position. 4) Lock the motor drive gear to the shaft, remove the paper shims, and you should be good to go. --------------------------------------------------------------------------------------------------------------- Package include: ►1 x WINSINN CR-10 Pro Dual Gear extruder Upgrade Kit (All Accessories show as Picture 2)