Features 3:1 GEAR RATIO AND DUAL GEAR REDUCTION MECHANISM: Features a 3:1 gear ratio and dual gear reduction mechanism, delivering stable filament feeding without slipping and providing greater torsion for extrusion. ADJUSTABLE SPRING DEVICE: Allows users to fine tune the pressure exerted by the dual drive gears on the filament, making it easier to switch between different materials and ensuring optimal extrusion. HIGH ACCURACY AND EXCELLENT PERFORMANCE: Equipped with high accuracy CNC hardened steel internal parts, ensuring smoothly filament feeding and optimal performance during printing. VERSATILE COMPATIBILITY: Works with all open source 3D printers that use 1.75mm diameter filaments, providing strong compatibility with a wide range of materials. WIDE COMPATIBILITY: Compatible with popular DIY 3D printers such as for CR10, for Ender, for D9, for Anet E10, Et4, for Geeetech, for Mizar S, for Cr10S Prusa I3, and for Ender 3 Pro, making the extruder suitable for a majority of printers on the market. Feature: 1. TRANSPARENT DESIGN: The transparent material allows users to better observe the extrusion process, ensuring smoothly operation and identifying any potential issues, especially with flexible materials like TPU. Specification: Item Type: Dual Drive Gear Extruder Material: Metal, High Density Engineering Plastic Package List: 1 x Extruder   1 x Extrusion Wheel   1 x Electric Frame  1 x Pneumatic Quick Hose Fitting   2 x Hex Wrench   3 x M3 x 35 Screws   1 x Tighten Adjustment Screws  1 x 2 x 4 x 100mm PTFE Tube 1 x Spring   1 x Washer 1 x Hook 1 x Manual  Package List 1 x Extruder 1 x Extrusion Wheel 1 x Electric Frame 1 x Pneumatic Quick Hose Fitting 2 x Hex Wrench 3 x M3 x 35 Screws 1 x Tighten Adjustment Screws 1 x 2 x 4 x 100mm PTFE Tube 1 x Spring 1 x Washer 1 x Hook 1 x Manual