Ball screw linear stepper motor
NEMA17 48mm two phase bipolar stepper motor
Rated current: 1.68A, 1.8 step angle
Rolled 1204 ball screw
Material: Gcr15, Ball Screw Nut included
According to RobotDigg's conclusion that ball screw linear stepper is Not good for Z-axis but much higher efficiency and precision for XY axis.
The conclusion is Not precise but Ball Screw is much easier to move backward when power off compared with same pitch lead screw.