For your next prints, I would suggest that you give the "salt method" a try. (=Wiping the glass plate with very salt water, prior to printing. No glue, no hairsprays.)
For PLA this gives a very strong bond when the glass is hot, but no bonding at all after cooling down to room temp: the models just pop off. No more need to take the glass out of the printer, no more recalibrating the build plate...
I use this since more than a year, and have had no problems since: no bonding problems, and no removing problems.
For the full description, see the PDF-manual at:
https://www.uantwerpen.be/nl/personeel/geert-keteleer/manuals/
If you try it, could you let us know how well (or how bad) it works?
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gr5 2,224
Put it in the freezer. REally. After 20 minutes take it out and immediately try to remove the part (before the part or glass warm up). It might just fall off (I'm always surprised when it does - I never learn).
Usually though I use a putty knife with one corner sharpened razor thin. Glass is tough - usually only diamond will scratch glass. It's the printed part you are more likely to damage.
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eldrick 65
The freezer is good advice, but using a putty knife on a hard-stuck part will sometimes take a divot out of the glass, leaving it stuck to the print. You will find whole threads on the topic.
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