Features: Compact Size: Size about 48x42x25mm and 102g lightweight. It is suitable for Creality 3D Printers Ender-3/Ender-3 V2/ Ender-3 Pro /Ender-3 S/CR-10 S/CR-10/CR-10 S5/CR-10 S4/CR-10 Mini/CR-20/CR-20 Pro; And compatible with most FDM 3D printers on the market as well. Easy Replacement: Both push-type and knob-type filament replacement are available. Quick release design, more efficient disassembly and installation, and hotend can be replaced quickly. High Torque: Adopt 3:1 gear ratio, dual gear meshing structure, more reliable and stable feeding and printing. Wide Compatibility: Applicable with Bowden and Direct Drive feeding to meet different users need. Driver drive more stable and it is recommended when printing with flexible filaments TPU. Modular Design: Users can upgrade to a higher torque motor with ease. Easy maintenance for various parts as well. Adjustable Spring: Adjust the spring pressure base on different filaments for more stable retraction, which results in more beautiful model. Specification: Model: EFit For: Most FDM 3D printers on the market; Creality 3D Printer Model Ender-3/Ender-3 V2/ Ender-3 Pro /Ender-3 S/CR-10 S/CR-10/CR-10 S5/CR-10 S4/CR-10 Mini/CR-20/CR-20 Pro Product Size: (LxWxH) 48x42x25mm (without motor and accessories) Drive: Dual gear drive Gear parameters: Module: 0.5, Number of teeth: 48 Material: Carbon steel E-STEP: 405 (can be fine-tuned according to actual printing conditions) Applicable filament: 01.75+0.05mm Packing Size: 115x75x90mm /4.5x2.9x3.5in Packing Weight: 300g/10.5oz Packing List: 1 x EFit Extruder 1 x Backplate 1 x Fan adapter plate 1 x Cable ties 2 x Wrench 1 x Air guide part 1 x Screw Kit 1 x Connector 1 x Silicone pad 1 x Tube 1 x Motor cable