The stepper motor driver of the 3D keyestudio Shield CNC V4 printer must work with the Nano card. It can be used like a driver expansion card for engraving machines and 3D printers. It has a total of 3 channel locations for the A4988 stepper motor driver modules (which are not included) for driving 3 stepper motors channels. Each stepper motor channel only needs 2 IO ports, which means that 6 IO ports are enough to handle 3 stepper motors. This shield can do a quick job for managing stepper motors in your project.