Quote Originally Posted by Geoff View Post
If you have the bed at the bottom of the machine when you preheat, the residual heat from the motherboard will rise naturally and heat the bed by 1 or 2 degrees, and if left long enough even more. My ambient temperature in the room is 26c and the bed reads 40c..

As Eagle said, the thermo couple not very accurate under about 50c, this goes for the Flashforges too, same thing. For me, off is off.. I just have to deal with whatever the temp is in the room, but I never need a cold bed... or never have in all the time ive been printing.
Ah but does that mean the temp is accurate over 50 ? ... I guess I'll have to get my IR thermometer out and see.