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Dual Drive Bowden Extruder Universal Geared Extruders for Ender 3 V2/Pro/CR10/Mega S/Tevo Tornado Wanhao D9/Anet A8 A8+ Prusa I3 Product Description: Dual Drive technology: This Bowden utilizes an internal gearing ratio of 3:1 together with precision cnc-machined hardened steel drive gears,which will minimize slippage and increase feeding strength. Fastening Spring Device: Bowden extruder allows the user to fine-tune the tightness with screw nut to fit with the most filament, such as PLA/ABS/ PETG/ TPU/NYLON/CARBON FIBER/WOOD. Reduction Gear Device: It can give out more torque,reduce the burden of the motor, extend the life of the motor. For Ender 3 V2, Ender 3 Pro, Ender 3 Series, Ender 5 Pro, Ender 5 Plus, CR10 Series, Anycubic Mega S, Tevo Tornado, Wanhao D9, Anet A8 E10, Prusa I3 and DIY 3D Printer. We recommend E-steps: 385. Any problem when you receive the order, CONTACT US FIRST please! About the shipping way (please choose your best shipping way when you placed the order) 1. Cainiao Super Economy Global -----this is the cheapest shipping way, but also has the long shipping time normally about 30-60days 2.AliExpress Saver Shipping-------------this is the most compatiive shipping way, shipping time about 20-35days 3. Aliexpress Standard Shipping--------this is the most safe and fast shipping way, shipping time about 15-25days