1DUAL GEARS: Double drive gear is used, the gear ratio is 3:1, with high accuracy, recommended to use 385 in step E, which is applicable to all 1.75mm consumables. 2SIMPLE ADJUSTMENT: Supports adjusting the tightness of the thumbscrew to suit printing, and 2 drive wheels grab the filament from both sides to provide a stable inlet. 3BOTTOM SLOT MOUNTING: The extruder can be installed with a bottom slot for bourdon tube slot installation, which is compact and convenient for installation and replacement. 4ALUMINIUM ALLOY: The extruder is made of aluminum alloy, lightweight and corrosion resistant, and lighter head to ensure that the printer can move faster and swing less. 5OTHER ACCESSORIES: Equipped with fasteners such as heating block, nozzle, spring and gasket, the extruder kit is easy to install and suitable for Ender 3 and for CR10 printer. Item Type: Extruder Kit Material: Aluminum Alloy Size: Approx. 73 x 41 x 36.8mm / 2.9 x 1.6 x 1.4in 1 x Extruder 1 x Spring 1 x Gasket 1 x Elastic Screw Accessory 2 x Pneumatic Connection Accessories 2 x M3x35mm Screws 1 x M3x47mm Screw 1 x Gear 9x13mm 1 x Heating Block Silicone Sleeve 1 x Heating Block 1 x Copper Pipe 1 x M6x21mm Brass Nozzle 2 x M3x6mm Screws 1 x M3x10mm Screw Before ordering, please compare the location and size of your printer extruder with ours to confirm whether it can be installed on the printer.