... Use Step / Servo Motor Ballscrews The U2 is with a stand . and we collect all electronical parts ... X, Y, Z axis are all updated with ball screws, including two screw nuts, plane bearing and couplers. All ... Y,Z axis. All the stepper mounts, ball screw mounts are made of steel, by wire cut machines. ... first sight, we installed a 3D bracket with a tray on it. The bracket can be localized at any height, ...