Features 1、ADJUSTABLE TIGHTNESS: Gear ratio is 3:1, with high accuracy, it is recommended to use 385 for step E, and adjust the tightness of finger screw to fit for printing 2、APPLICABLE CONSUMABLES: This gear is suitable for all 1.75mm consumables, even flexible consumables such as TPU 3、DUAL DRIVE MODE: Two drive wheels grab the filament from both sides to provide a stable and reliable water inlet. From common materials such as PLA and ABS to flexible filaments such as TPU or TPE, the dual drive gears provide consistent filament flow in direct drive or Bolton configurations 4、SUPPORT FUNCTION: The extruder can be fitted with a bottom mounting slot for Bolton tube slot installation 5、LIGHTWEIGHT AND FAST: Dual drive extruder design makes it suitable for direct drive configuration. Because helps to reduce the weight of the tool head. A lighter head means the printer can move faster without sacrificing accuracy or print quality by wiggling Specification Item Type: Extruder Kit Material: Aluminum alloy Package List 1 x Extruder 1 x Spring 1 x Gasket 1 x Elastic Screw Fitting 2 x M3x35mm Screw 1 x M3x47mm Screw 1 x 17 Gear(dia9x13mm) 1 x Heating Block Silicone Sleeve 1 x Volcano Heating Block 1 x Copper Pipe 1 x M6x21mm Brass Nozzle 2 x M3x6mm Screw 1 x M3x10mm Screw