Improvements in a rotary screen printer that operates with a stepper motor for indexing the screen printer. The stepper motor provides a positive rotation and locating of the printing arms. The stepper motor can also have a controlled acceleration and deceleration speed while it indexes. The stepper motor further drives a spur gear to improve the drive ratio from the stepper motor to the indexing arms. The rotary screen printer uses pneumatic cylinders to operate the screening arms. Pneumatic cylinders are controllable for the downward force by adjusting pressure regulator(s) and the stroke by adjusting either limit switches or mechanical stops. Each station is interchangeable to accommodate the printing requirements of each job. Each station can be operated as a screen printing station, a drying station, a pad printer, and the number of stations can be changed by reprogramming the number of steps between each station stop.