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my crazy idea to power a ender3v2 off USBC PD
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this post was submitted on 26 Nov 2023
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That would be difficult because you would need to somehow separate the power control MOSFET's from the driver boards so that the controller can still feed them a PWM signal for temp control, but the power would be provided from a separate dedicated usbPD driver board for each set of MOSFETs. At that point it's really not worth the effort.
USBC PD could work for my old monoprice select mini v1 https://youtu.be/VehfqrkoXJA
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Could you not just do something similar to what printers with mains heated beds do and run the bed/hotend heater to a relay and different power bank?
Sure, but on these fully DC printers all the power control hardware is integrated into the main board and supplied from a single main power rail. You'd have to basically build a separate power control board with that would allow you to isolate those MOSFET's on their own power rail and then jump the PWM control signal over to it from the main board. Decent amount of electronics knowledge and skill required to pull that off.
Yeah but why would you need to do that? You're isolating the second power source behind a relay and switching it using the normal controller.