SHENZHEN GETECH TECHNOLOGY CO,.LTD13Port:Get the printer connected to the port of computer, which is corresponding to the USB Serial Portin the Device manager.Baud Rate: Corresponding to the Baud Rate in firmware. Generally it is set as 250000.Note: If the operating system is Mac OS, please set the baud rate of the firmware and Repetier Host as115200.Open the firmware in Arduino, and modify the baud rate to 115200 in Configuration.h. Shown asfollowing picture.After modification, re-upload the firmware: