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I don't like the solution to drive a mosfet with a mosfet. If something fails, the security features of Marlin may not affect the external mosfet and the heated bed gets full current without temperature control. Instead, I changed the on board mosfet to a IRLB3034PBF mosfet, as mention in the instructable "Upgrading Your RAMPS With High Power Components". After this mod, the mosfet is now 3-5 kelvin above room temperature, instead of 60-90°C.