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Dual-drive Bowden extruder has an internal transmission ratio of 3: 1 and high accuracy, and we recommend E-steps:385 Adjustable Tension: The thumbscrew tensioner allows the user to fine-tune the pressure exerted by the drive gears onto the filament Suitable for most 3D printers and filaments Warranty: free return/ exchange in 90 days Packing with: 1x Bowden Extruder, 1 x Universal Stepper Motor Bracket