BZ 3D Dual Gear Extruder Dual Drive CR-10S Pro Extruder Upgrade Kit, Works with Ender 3 /Pro CR-10/CR-10S/CR10S Pro

Note: ?After-sales guarantee: each defective item can be replacement for free or refund. If any question, please feel free to contact or QA us, BZ 3D is committed to providing you with the best service! Specification: ?Upgrade Dual Gears, easy for feeding, no blocking, better pressure pushes the filament into the printer nozzle; Upgrade Spring, very strong, do not easy out of shape. ?The origin...