How to modify MAX31865 temperature readings?

[EddyMI3D]

@0scar

Temperatures are all irrelevant

Are that sure?

The readings are not for observation, they are for setting the hotend to the proper temperature for the used material. A few degrees can decide if there is stringing or clogging. The reading should be quite precise. Not be ironed down to a proper view.

@0scar

Please explain me how I can adjust the second one rather than delving into the difference or the correct sensor.

Scaling temperature readings

I measured the offset between bed thermistor and print surface at various temperatures so I can define a linear or parabolic formula to scale the readings to obtain the “real” temperature. Clearly the goal is to have the set temperature to also be the real one, without having to remember the offset, even more so when multiple printers are in use and each one has a different offset. However, it’s not clear to me, after reading the docs about thermistors, how to do it, if it’s even possible. Ca…