Recently, I got my hands on a thermal camera from FLIR, model T420, and I thought about checking the uniformity of the heat on the bed. So I heat up the bed in three, most common for me, temps, waited for the system to stabilize and took the following three thermal pictures:
Set Temp 60C
Set Temp 80C
Set Temp 110C
And here is a digital picture of the assembly
On the thermal pictures, the crosshair pinpoints the coldest spot within the bracketed area, while the rainbow bar on the right of the photo describes the measured temperature range of the entire photo.
It’s obvious that the glass performs quite poorly with regard to the heat surface distribution, especially with the center, the top-left quadrant and all the corners.