Most, if not all electronics solutions use an EN (enable) wire to toogle the stepper driver output to the motors. And most, if not all firmwares do disable the stepper driver outputs after a certain timer of inactivity, like 30 secs or so. The gcode file should contain last commands to turn off motors, extruder and bed (if used). With all those turned off, the only remaining consumer is the uC itself, which is quite neglectable. If it uses like 100-200mA at 12v, in comparison that is like an 10mA led running at mains power, like the led of the tv or such things which are always on. So at this point we are counting two marbles. Coz if you want to minimize energy use, instead of picking on a uC consumption, you can add extra insulation to the fridge, insulate the house, change all lights to leds, use foltovoltaic cells and that sort of things, and that mcu consumption is among last things on the real list.
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