I've heard great things about the PEI print surface and decided to give it a try. Materials used are 0.03" thick 12" by 12" sheet of PEI, 12" by 12" 3M 468MP adhesive and a 12" x 8-7/16" sheet of glass. For me total cost of materials was $21.35 USD.
Setup was a little sketchy. That PEI and adhesive are tough stuff, glass was the weakest layer. If you've never bonded to layers with adhesive or used transfer tape then watch some youtube videos, get some ideas about how it's done. I wont give any advice because I don't think I did it best. I did somehow succeed in getting the glass and PEI bonded without breaking the glass. Oddly the 12" PEI and adhesive were shy of the 12" glass.
The adhesive and 0.03" PEI add about 1mm to the build platform. I regret that I can't report the added weight on the Y axis; I don't have a precision scale.
Heated print bed sandwich!
I was surprised by the temperature difference between the top and bottom of the heat bed. 90° on bottom and 60° on top. I let it heat for quite a while and if never broke 60° at 90° bed temp. Consider this is at the edge of the build platform.
First print, no failure. For my first print I printed the last PETG print I did on bare glass. I did have some support material come loose, but it wasn't a show stopper. Next I'll try to print a model I couldn't get to succeed on bare glass due to curling.