Creality CR6 SE auto leveling and Z axis adjusting

I want to know when we are auto leveling the printer do we need to set nozzle temperature only or we should also heat up the bed?

Same way when we are adjusting Z axis by under paper it, what should be the nozzle & bed temperatures?

The theory is that you should not heat the nozzle while doing this with paper, because the standard nozzle expands by about the thickness of a regular sheet of printer paper.

I’ve mostly seen suggested to heat the bed.

I heat the bed to a normal temperature, and I heat the nozzle and check height with a .0001" thick piece of steel shim stock or a feeler gauge, rather than using the paper trick, which I have found to bed more consistent.

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Here’s the Klipper documentation on “the paper test”

https://www.klipper3d.org/Bed_Level.html#the-paper-test