Bed heating problem
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@ander with the steep rise at the beginning, then flattening out, along with the inconsistent heating cycles (they get quicker as time progresses), I’d say your thermistor is still too closely coupled to your heater, and as before, it’s going to be difficult to get a reliable tune.
I know some users have drilled a hole in the edge of their heated bed, and installed the thermistor there.
Ian
