1、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. 2、HIGH ACCURACY AND EXCELLENT PERFORMANCE: Equipped with high accuracy CNC hardened steel internal parts, ensuring smoothly filament feeding and optimal performance during printing. 3、VERSATILE COMPATIBILITY: Works with all open source 3D printers that use 1.75mm diameter filaments, providing strong compatibility with a wide range of materials. 4、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. 5、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. 6、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.