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I'm using an Ender 3v2 with the stock 4.2.2 board driving the X, Y, E0, E1 axes. Z0 and Z1 are driven by a 1.1.3 board. Running Klipper v0.10.0-584 on a Raspberry Pi 3B+. I was using the depreciated “shared heater” function in the 2nd extruder. So when it was done with one extruder it would turn the heater off. I fixed it by overriding duplicate pins for the heater and thermistor. Then did PID for “both” and it worked. But it’s trying to adjust 2 heaters when there’s only one so there was a huge variation in temperature over the duration of the print. Maybe +/- 5°. Then I deleted the PID for the 2nd extruder as it was slightly different than the PID for the 1st one. I copied the PID for the first and pasted it into the 2nd one. Slightly less variation in print temperature but still more than I’d like. Currently I'm using the [extruder_stepper] object which is more more stable but still causes the heater to turn off. It'll print perfectly for 95/100 layers, but as soon as there is no need for one of the extruders, the heater turns off and the print fails. config.txt klipper log.txt