Just had to show this off. Here's how wrong it can all go. Of course, this was an overnight print, and against all advice I left the printer to its own devices. I claim responsibility for leaving my printer unattended The sequence of events ... it took about 30 minutes to go from 1 to 4. 30 worried minutes. But it's all back working again now. I'm really not looking forward to attempting to get the heater and thermistor out of there now though.