The UM3 has 24V.
24V could be pulled from the FAN connector all the way on the side of the board, this is an "always on" connection. A different place to get 24V from would be the 2 pin LED connector. This is off by default, and can be switched on with M42 S255 from GCode.
Note that the UM3 is stretching the limits of the power supply. If you are planning to use more then 10W, you will have to use a different power supply. And I recommend unplugging the case lighting to save some power there.
If you use too much power, the printer will seem to restart. But the LED on the power supply will go off when this happens. That is a way to see you are using too much power.
We are so stretching for power, that we are regulating the amount of power to the bed by the temperature of the bed, and estimating how much the hotends are using. All to prevent the powersupply from switching off.
The NFC connector only has 5V.
@daid; Could you chime in on this?
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