GRBL Compatible CNC Uno Shield and Expansion Board for 3D Printer
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This expansion board is used as a driver expansion board in engraving machines, 3D printers. It has a total of four slots, can drive four A4988 or DRV8825 driver based stepper motors. Each stepper motors only needs two IO ports. In other words, six IO ports can be used to well manage three stepper motors.