Main Control Chip: Uses a 32-bit ARM Cortex-M4 series STM32F446ZET6 main control chip with a core frequency of 180MHz Strong DIY Support: This 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 Printing: Interfaces 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 Function: Support 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 Function: Uses high-p