Slice engineering thermistor temp problem
Work Horse XL last edited by
So I have put a external test sensor on my Slice engineering hotend and the temperature is off by about 25 degrees.
It's reading low and I have to increase my setting to 265 to really be a 240 hotend temperature. I know it must be low as I has have issues printing PETG and PLA+. When I increased temp to 265 problems goes away. The problem is the filament won't push through the hotend at the lower temp setting.
Here is my config line. How would I go about correcting this? Would I just increase the B value until I get close to actual temp it should be?
M308 S1 P"temp1" Y"thermistor" T500000 B4723 C1.19622e-7
The problem is that the Slice thermistor has such a high resistance that it's very difficult to get an accurate reading at low temperatures using a standard value series resistor. The accuracy will be much better at normal hot end operating temperatures. So don't add 25 to the hot end temperature you want.
Which Duet and RepRapFirmware version do you have? Most RRF versions support an additional H parameter to the M308 command on most Duets, that can be used to correct for high-end ADC error. See https://duet3d.dozuki.com/Wiki/Calibrating_thermistor_and_PT1000_readings.