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my heated bed is showing a 12 degree difference between my thermocouple on my meter and the thermistor in the bed. this is with the glass on. is there a line in the config,h for the bed that will allow a change like you can do with the hotend.

Tom C

The top of the glass could be 12 degs colder.

well that sucks. I know there will be some difference, but that puts the edges of the bed to around 60, anything below 70 and I get curling on the edges with abs. I guess after I crank it up to 24 volts (still have not gotten my second SSR from amazon) I will just have to run the temp up until it actually is hot enough on the perimeter.

Tom C

I was wondering the same thing. Why is there a process for calibrating the hotend, but no calibration process for the heated bed?

The heated bed calibration use to be in the manual (last revision I think), not sure why it was pulled.

I believe this is the correct code for 80c. M303 P1 S80




Edit, didnt mean 180

You can change the thermistor type to be custom, calculated from a Beta value, then tweak that beta value to match the actual temperature in the range you usually measure.
I do this with my hot-end, though mostly because the thermistors supplied with the E3D hotends I have were miles off.
I usually don't bother with the bed, I just know that with it set to 80C whatever the actual temperature is sufficient to print with ABS, 60C for PLA etc.

KAS wrote:The heated bed calibration use to be in the manual (last revision I think), not sure why it was pulled.

I believe this is the correct code for 80c. M303 P1 S80




Edit, didnt mean 180 :)

Thanks. I'll try that. My fan shroud came off the bed about 75% of the way through my first ever print, so I'm concerned the temperature was lower than it needed to be for good adhesion.