I have one of the AliRubber silicone heated beds.

3D Printing HercuLien and Eustathios
1

I have one of the AliRubber silicone heated beds. I know the thermistor beta spec is 3950 and its resistance is supposed to be 100k at 25C. I set up the appropriate value in smoothieware config file and I’m getting readings of 130C at room temperature. The second thermistor also reads the same. Does anyone here have any idea what to try next?

The thermistors do respond with added heat (hand touching sensor area).

2

Maybe http://www.ametherm.com/thermistor/ntc-thermistors-steinhart-and-hart-equation

3

I think I figured it out. Ali Rubber said it was 100k @ 25C. On a multimeter, it reads less than 3k in that temp range. R0 = 2850 gets me readings that line up with my thermocouple meter so far.

4

A beta of about 3500 gets me readings that are pretty close to my thermocouple when at temp, at least in the 60-70C range. I won’t try higher just yet.