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ambrop7
Oh, I've fixed the inverted heaters problem in APrinter. I don't think there's anything now preventing it from running on a real RAMPS-FD.
@bobc If you find some time could you give APrinter a test on your board? All the instructions are here, including building for Due/RAMPS-FD. You need Linux and the latest gcc-arm-embedded compiler (link in instructions).
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With the board connected using the programming port, press the erase button, then the reset button, and finally run flash-rampsfd.sh to upload the firmware to your board.
The erase button is pretty much inaccessible with the RAMPS-FD attached, but the command "stty -F /dev/ttyACM0 1200" will erase the Due and put it into the bootloader.