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Is it possible to use the UM2 Dual Extruder head for the Original, if I replace the L7812 on the board with a R-78C12 and use a 24V 30A Power supply?

What about then hooking up a heated bed directly to the board as well, or would that fry something on the board?

Also would there be any firmware issues If I compiled with the correct thermisters in Ginge's Marlin Builder?

Wow, so many questions, but any answers would be helpful, thanks.

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