RPM fan is proportional to temperature
Is it possible to control the fan speed in proportion to the temperature of the extruder?
Yes, look up M106 in the GCodes page of the wiki.
Just now the fan on 40% at a temperature of 50 C. I do not know how to make an example:
200 С -> 40%
220 С -> 50%
260 C -> 100%
To use several M106 commands?
M106 Pnn Hnn L40 S1 T200:260