DescriptionThis expansion board can be used as a drive expansion board for engraving machines, 3D printers, etc. There are a total of 4 slots for stepping motor drive modules, which can drive 4 stepping motors. Each stepping motor only needs 2 IOs mouth. In other words, 6 IO ports can manage 3 stepper motors well. It is very convenient to use, bid farewell to the cumbersome traditional stepper motor operation.Features- Color: Black. - Material: Plastic. - Size: 7.00X5.00X1.20cm/2.75X1.97X0.47 inch. - A4988 V3 Engraver Drive Shield 3D Printer CNC Drive Expansion Board. - This expansion board as a driver expansion board, can be used for engraving machines, 3D printers. - PWM Spindle and direction pin. 4-Axis support. Runs on 12-36V DC. - Stepper motor wiring as follows: 2A, 2B is a group (red, green), 1A, 1B is a group (blue, yellow). - If want to change direction, can be change the position of one group , for example 2A, 2B mutually exchanged.