I have an Ender 3 Pro with the BigTreeTech SKR mini E3 motherboard and a glass bed, and I use Klipper running on a Pi. About a month ago it started giving me the "heater bed not heating at expected rate" error and stopping during warmup. I was trying to print at 80 °C. I replaced the bed heater and thermistor, but got the same error. It would successfully start printing if I lowered the temp to 75 °C, but the PETG wouldn't stick to the bed.
I added the following to my printer.cfg without improvement:
[verify_heater heater_bed] check_gain_time: 80
Yesterday I changed back to a magnetic print bed and it is printing at 80 °C.
Any idea what is going on, and why is it happening now (it used to work fine)?
