I've had my MK3 with the PEI spring sheet for about two months now. I've done lots of prints in PLA and PETG. The other day I did a PETG print and when I flexed the sheet to take off the print, part of the PEI broke off and was stuck to the PETG. Is this expected to happen over time? For now, I'm flipping the spring sheet to use the other side (it is double sided).
One thing I noticed, when I typically take off a print the steel sheet is still warm (40C or so) and the prints come off fine. The other day, the sheet was cooled down (about 19-20C).
I almost never use a tool to take off the prints, flexing is more than sufficient. Sometime I'll use a the supplied spatula to get the brim or starter filament off the plate, but do so very lightly.
So will I need to replace the whole PEI spring sheet? Or is it possible (less costly?) to replace the PEI? Which of this options is recommended?