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USE: Use a removable A4988 or DRV8825 compatible step controller APPLICATION: Extension board can be used for engraving machine or 3D printer driver GRBL 0.8 Compatible: GRBL 0.8 compatible Open source firmware operated on ONE, which converts the G-code command into a step signal 4 SHAFT BRACKET - PWM shaft and steering, 4-axis support (X, Y, Z, A - you can copy X, Y, Z or use D12 and D13 pins to customize firmware and complete axis 4) COMPACT DESIGN: Compact design, stepper motor can connect 4 pin connectors or be welded