5mm-8mm Coupler Mod-XC51100 bearing

This is a mod to my standard 5mm-8mm Coupler. This version is designed to center the XC-51100 thrust bearing. This allows the weight of the vertical (z-axis)screw system (prusa type) to be taken up bu the bearing and the structure of the stepper motor, not the shaft and rotor of the stepper. This will prolong the life of your stepper motor, eliminate any drag that can happen when the coupler works its way down during operation.