Re-design this Thing after some testing and tuning. Work pretty well and more accurate as this original K8200 geared extruder! It´s quiet, smooth and less "Blobs and Blips" while printing. Work with PLA and ABS! Just use the original Bearing for the Lever plus 4 Screws from the Hardware Store and 1 Hex for the Mounting to the Profile. Also an MK8 9mm diameter Extruder Gear. Use the Lever Spring from K8200.