An nozzle of my Snapmaker U1 failed with printing and the clog ended up breaking the frail temperature sensor.

The spare about are expected to arrive within about a month (stock runners out, and I didn't had spare parts of these because they have never broken on my old printer).

I moved the nozzle heater and sensor from head 2 (E1) to head 1,since the left head is like a master and you can't do without apparently. I set the min_temp of [extruder1] in the printer.cfg file super low. And now it can boot up again.

The printer runs just fine on the other nozzles now, just can not do a nozzle offset calibration and such since that requires heating the nozzles. Meaning nozzle 1 has a wrong offset (but can be used on its own), nozzle 2 is completely out, and nozzle 3 and 4 can be used for multi material printing.

It's current printing! So no time to waste. Let us engineer and print more, and enjoy the hobby

Ah yes, physically impossible temperatures, the key to every good print.

What do you mean physically impossible? Obviously by going below 0°K time starts moving backwards.

I once received an alert from a server temperature sensor for a reading hotter than the surface of the sun.

I think it needs a bit of airflow. Unless your trying to make plasma

Then why, praytell, wasn't this fixed last week, hmmm?

Did you happen to have the nuclear fusion setting turned on?

The answer to this question highly depends on which time travel framework we are working with.

"Yesterday's Enterprise", TNG S03E15

I need this for my work, they want everything thing done by yesterday.

I don't know where you live but Amazon has replacement U1 hotends, which includes temp sensor, for 2 for $20 with 1 day delivery.

I picked up 4 to keep in a drawer for when the inevitable unrecoverable clog happens.