We are running this setup on our nearly gutted and rebuilt Cubex Duo and we have been unable to flash Marlin successfully. The power works to the Mega and the Ramps 1.6. The LCD lights up and when we upload Marlin, it says it compiles just fine. However, we get nothing that is obvious. Several red LEDs are lite on the board now, not sure what any of it means. The same Marlin setup is on our FT5-R2 and we just flashed it last night to be sure it worked in the current configuration... Gold! it seems to be not working with the Ramps 1.6. thoughts?
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