Update1: SIMAX3D Dual Gear Extruder V3.0 make an independent feeder inside to make filament wiring go inside and out super smoothly.
Update2: SIMAX3D Dual Drive Extruder V3.0 change the bowden buckle to pneumatic connector, you're able to switch only this part after long time use instead of the whole extruder.
Update3: This Geared Extruder has an angle for Z-rod which is adapted to those 3D Printer who has an close Z axis installed like Ender 3 old version.
Package Include: User Manual*1. SIMAX3D Dual drive extruder set *1