Main Control ChipUses a 32-bit ARM Cortex-M4 series STM32F446ZET6 main control chip with a core frequency of 180MHz. Strong DIY SupportThis motherboard supports up to 8 stepper drivers with 9 stepper driver outputs in total; And up to 6 PWM fans and 2 always-on fans with the ability to individually select the voltage rail that will drive each fan. Select from Vin, 12V or 5V. Realize Online PrintingInterfaces with a Raspberry Pi using emulated serial over USB or direct UART to any of the serial ports on the board, to realize Klipper Firmware and Raspberry Pi Online Printing. Motherboard Expansion FunctionSupport BLTouch, locked-rotor detection, shutdown after printing, resume printing after power failure, CAN bus, U disk function, IIC expansion; at the same time reserved WIFI interface, PT100 thermistor interface (optional, Only reserved interfaces, customers need to purchase chip welding, please pay attention.), dual Z-axis printer. Increase Protection