Feature: Extruder upgrade kit can solve your feeding and grinding problem, also give you higher resolution. The BMG utilizes an internal gearing ratio of 3:1. Combined with the dual drive precision CNC-machined hardened steel gears for maximum performance and for a long lifetime. Providing unparalleled pushing power and fast retractions whether you require high resolution prints with small nozzles or high-flow prints with big nozzles. Package comes with the 1*BMG extruder, 1*gear, 1*motor bracket, 2*hexagonal wrenches, 1* tube, 3*screw M3*35.