Multi heater bedquestions
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If you have the option I would add a separate thermistor to the bed plate itself so that you could get a more accurate PID loop going for the bed surface temp. The thermistors from the pads themselves could still be used as you're suggesting and used as a thermal limit monitor on the heater pads.
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@Phaedrux That's the plan long term, however in the meantime (waiting on parts that are on backorder) I was going to use the built in ones as a stopgap to be able to print until then.