Z axis leadscrew support for FLSun I3 style printer. Fits 608 bearing. If you have your Z axis end stop at the top, like mine, you may have to move it from the right side to the left to allow bearing mount installation. This bearing allows for a higher Z axis feedrate without the typical chatter of the screw in the feed nut. Reduced homing and print preparation time is achieved. It may fit other printers providing the upright and Z axis motor placement are the same.