Aluminum Double Gears Extruder Block MK8 1.75mm

Upgraded Replacement Aluminum MK8 Extruder Drive Feed for Creality 3D Printer Ender 3/3Pro CR-10, CR-10S, CR-10 S4, and CR-10 S5 (Dual Gear Extruder) 1.Dual gear extrusion mechanism, high extrusion force, ensure smooth feeding, you need to change the extruder e-steps from 100 to 140 2.Perfect upgrade replacement for Creality 3D Printers CR-10, CR-10S, CR-10S Pro, Ender-3, Ender 3 pro, Ender 5 ,Tornado etc. stable and durable. 3.All-metal extruder aluminium alloy, DIY aluminium block, self-assembly 4.Update on 2021/04/26: The too long spring has been changed to the right size 5.Better pressure pushes the filament into the printer nozzle