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  • If you are getting errors compiling for a printer with the 2560 board in it go to Tools > Boards > Board Manager. Look for ATmega2560 & revert to 1.6.21. Some users reported issues on Mac OS X with the latest 2560 board library.
  • If you are having issues with uploading and/or connecting to your printer board over the USB port try updating the drivers. They are included in the Unified Firmware download and available separately here: CH340 Drivers & FT232 Drivers

Installation Instructions:

Arduino 1.8.7 IDE
Arduino Libraries