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The Arduino CNC Shield is an expansion board designed to simplify the control of CNC machines, 3D printers, and laser engravers. It provides an interface for multiple stepper motor drivers such as A4988 and DRV8825, allowing independent control of up to four stepper motors. The shield is designed to work seamlessly with GRBL firmware, making it a popular choice for CNC enthusiasts. With PWM spindle control, end-stop connections, and I2C expansion support, it offers a complete motion control solution. The board is plug-and-play with an Arduino Uno, reducing wiring complexity and setup time.