This expansion board as a driver expansion board, can be used for engraving machines, 3D printers.It is a total of four slots, can drive four A4988 stepper motor. Each road stepper motors only need two IO ports. In other words, six IO ports can be well managed three stepper motors. Very convenient to use.UNO for Arduino module IO port correspondence introduction.

• SunRobotics CNC shield v3 A4988 Controller for RAMPS 1.4 Reprap 3D Printer & GRBL Compatible
• GRBL 0.8c compatible. (Open source firmware that runs on an Arduino UNO that turns G-code commands into stepper signals
• 4-Axis support (X, Y, Z , A-Can duplicate X,Y,Z or do a full 4th axis with custom firmware using pins D12 and D13)
• Stepper Motors can be connected with 4 pin molex connectors.
• Runs on 12-36V DC. (At the moment only the DRV8825 drivers can handle up to 36V so please consider the operation voltage when powering the board.)