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Check the listing for details. 5PCS A4988 Stepper Motor Driver Module 3D Printer Polulu StepStick RAMPS RepRap. Condition: New. Listed at 4.97 USD. The A4988 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. This stepper motor driver lets you to operate bipolar stepper motors in full-, half-, quarter-, eighth-.