Duet Wifi - Accel
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Please try this method to try and determine your R parameter.
Measuring the heating rate (M307 R parameter)
Turn the heater on from cold, wait a few seconds for the temperature to start rising, then time how long it takes for the temperature to rise by a further amount e.g. 10C (for a slow bed heater you might wish to use a smaller amount e.g. 5C). Divide that temperature rise by the time in seconds to get the heating rate.