if its overheating, I bet its either the fuses or the mosfets or the stepper controllers. 12.48v is perfectly within spec. I belive the arduino voltage regulator gets sketchy after 15v or so, so your within a good range. I would try to use a fan and install the heatsinks on the stepper controllers and see if that makes a difference. My own printer seems to like a bit of cooling on the ramps. I will be 3d printing a case for the ramps soon enough to have a place to mount the fan on.
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