Glass build plates
What advantage does a glass build plate have and how best to maximise that benefit.
The main advantage of glass build plates is that they grip the print when hot, and release it automatically when cold. So rather than having to peel and scrape your print off forcefully with a spatula, you just wait for the bed to cool and the print pops off completely by itself, or with a light nudge.
A second advantage is that the bottom surface of prints made on glass plates end up flat, shiny and reflective - like glass.
A third advantage is that glass is very flat. That's not to say that all glass plates are perfect (they still might have some warpage, particularly if you buy cheap plates from China), but generally speaking they are flatter than the metal plate on the base of most inexpensive printers.
Lastly, glass is cheap. You can go to a local glass cutting shop and pick up a sheet for a few dollars. I cut a 220mm diameter 4mm thick plate for my anycubic Kissel for just €3.50 locally.
To best take advantage of these characteristics, do not put anything on the glass. If you apply glue stick, you will get better adhesion, but your print will have a rough surface (same as the glue surface) and it will most likely need a little mechanical encouragement to pop off the plate.
Personally I gave up on glass plates after a few too many adhesion failures, and switched to ultrabase plates. They are basically glass with a ceramic-like coating. They have significantly better adhesion than plain glass and still retain the property of prints popping off when cool. However you don't get a shiny bottom surface with ultrabase like you get with glass.
Hope this helps!
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