Well, I can get the 5.6v ones for under $5 each. At that price I suppose I can give them a try, and I can probably run the steppers on 24V easily enough. It's actually easy to isolate the heaters and fans on the ramps board from the stepper motors since the MOSFETS switch the cold lines. You don't HAVE to connect the 12v ends of those back to the ramps board, they can go though their own fuses to the 12v rail. Just have to remove the LED's from the ramps and rewire them off board. But you don't really need the fan and heater LEDS at all.
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