... from 1500~3000$. Portable Use Step / Servo Motor Ballscrews 1. X, Z axis are all updated with ball screws, including two ... provide very high localization accuracy. It has one 23 high speed stepper motor for X, one 34 stepper motor for Z axis.2 ... rigidity than other plans which using aluminum mate.3. The X, Y axis steppers, we made shells to protect them from ...