basically I blow hot air on the board and the readings of the thermocouples go up, even if I’m not heating the extruders
Could this explain why the readings are out by 20-30 degrees while printing?
Zapaer
2
@Jacopo_2 I mean you are blowing hot air at the electronics board (not recommended), you actually want to have a fan on the electronics board to keep it cool.
By blowing heat on the wiring of the thermistors (for the hotends) you are reducing the resistance of the wires which most likely results in the in the spike in temperature readings. Thermistors work by monitoring the change in resistance in the wires.
the ctc uses thermocouples, not thermistores
Zapaer
4
Either way, probably what happens is the heat travels up the wires to the thermocouple.
Zapaer
5
It could also be this: “The second major factor in running a thermocouple wire is to keep it away from any electromagnetic fields. Thermocouple wire creates a low voltage signal and should not be run near power wires, motors, etc. To help minimize noise pickup, a metal over braid or twisted shielded wire is commonly used.”
Maybe the electromagnetic field from the hair dryer is causing it to act weird.
