Are you looking to power down the power supply to turn the printer "off"? Or are you looking to disconnect all power? Depending on what electronics you're using, many support turning on and off the power supply by grounding (or ungrounding) the green wire from the power supply. This requires the electronics to be at least minimally powered but allows the printer to be turned on and off via gcodes. But it does leave things at risk for damange via a short or unplugging something when it's powered accidentally where a hard disconnect would prevent any risks.
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