"Cold spot" on my heated bed?

[Roxy]

Maybe it is the heat bed temperatures I'm using. When printing with ABS, do we use 90 or higher for the heated bed?

I print ABS at 110 C. But remember, that temperature is going to vary. In my case the thermistor is taped to the bottom side of the heater and the sides are sealed off. By the time the heat gets up to the surface of the glass, I suspect it is significantly cooler.