I wanted to print with the bed heater off but I can't find a setting in makerbot program to turn it off during print.
I just set it to 30deg. then noticed, when the print wouldn't start, that the display was showing 40deg when the printer was cold.
So I see when I first turn on the machine and check the temps monitor the two extruders are at 29deg. and the bed is 40deg. Since it's 29deg here today then two of them are correct.

Does anyone know how to calibrate the bed thermocouple on a CTC 3D printer ?