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ok everyone,
i tested with my other ramps, which worked. so i remapped the heated bed pins to D9 in pins.h on the stock ramps, and the whole thing works!
problem solved - hopefully.
thanks so much for all of your help and replies, im very impressed with this forum.
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guess what? theres another problem.
when i tell the bed to preheat to 75˚ it blows past and just keeps heating until it reaches 90˚ at which point I unplugged it. Some people have had similar problems except their beds immediately do this when the printer is turned on. Mine only starts when I tell it to.
im going to make a new thread for this, see http://3dprintboard.com/showthread.p...6266#post76266