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The fifth stepper motor output port can be customized as a Z-axis motor or a second extruder; Scalable to control other accessories; Field effect transistor 3, 3 a heater / fan output ports, three thermistor circuit; Bed heating control, additional 11A fuse; It can be equipped with five Pololu stepper driver board; Pololu board socket, can be easily replaced or removed; I2C and SPI pins can be used for subsequent expansion; Heater output has a corresponding LED indication;