Thermistor offset

nick9one1

Is there a way to set an offset in M308?

I have 100K ohm NTC 3950 in both the hot end and bed, but the both read a coupe of degrees out.

; Heaters
M308 S0 P"bedtemp" Y"thermistor"T100000 B3950 C0 R4700 A"Bed Temp"  ; 
M308 S1 P"e0temp" Y"thermistor" T100000 B3950 C0 R4700 A"Hotend Temp"   ;

Veti

beta 3950 thermistors are not good for accuracy

the best way to adjust them is to measure the resistance at 25, 160, 220 using a known good temperature measuring device. then use those values to calculate the B and C for your thermistor.

or you could replace them for example with semitec 104 thermistors.

I personally use pt1000.

dc42

https://duet3d.dozuki.com/Wiki/Calibrating_thermistor_and_PT1000_readings