1、UPGRADED INTERFERENCE RESISTANT: For Robin V.3.1 is an updated version of for Robin V.3.0. The MCU is changed from STM32F407VGT6 to STM32F407VET6. More importantly, for Robin V.3.1 improves interference resistant performance, such as adding Schottky diode in temperature measuring circuit and MOS circuit, and TVS protection in power input 2、COMPATIBLE PRINTING: Compatible with U disk printing and small memory card(not include) printing, as we all know, U disk is more convenient to use than small memory card(not include) 3、MORE POWERFUL FUNCTIONS: MCU update to STM32F407VET6, faster speed and more resources to support more powerful features 4、SUPPORT VIRTUAL USB DEVICE FUNCTION: Connect a PC to the motherboard with a USB cable, and the small memory card(not include) and USB flash drive on the motherboard can be read and written from the PC just like reading and writing USB flash drive. This copy of gcode file does not require repeated insertion and removal of small memory card(not include) and USB flash drive 5、SUPPORTS A VARIETY OF LCD SCREENS: Such as for MKS TS35, for MKS H43, LCD12864, LCD2004.. WIFI module increases SPI connection, SPI rate is much higher than serial communication (currently released firmware only supports serial communication, SPI communication version will be updated soon)