I like the thermal mass of glass for temperature stability, as I’ve found that’s pretty key to getting good print adhesion. But I really wanted to try out PEI without having to stick a giant magnet directly to my heater plate, something I definitely did not trust.
Turns out, you can solve both problems! This was how I did it.
I had a friend whose CR-10s I’ve subsequently adopted… (he wasn’t all that into 3d printing, as it turns out.) when were getting started the glass build surface was absolutely terrible. (I kinda expected it would be. it was basically 1/8" picture frame glass. 3/16" or 1/4" boro or bust.)