[Solved] How to remove glass from ABS+hairspray

I discuss that here.  I am definitely also interested in ideas to avoid the problem without giving up holding power but primarily was looking for a good procedure for removing glass from parts once the deed is done.

That is some serious adhesion right there. Or really bad glass.

I do follow your procedure with the razor except I don't let it cool.  It's when I let it cool that I have this problem.  If I remove the part immediately after the print completes using the razor blade on all sides followed by the spackling knife I can peel it up without incident (other than burned knuckles).  In fact, I don't think I've ever had this happen with a hot bed.  The part in the picture, however, was a job I started before going to bed (safety has been addressed so lets not sidetrack :-)) and so it had cooled fully.  In the morning, I stuck the razor under one side, and POP it popped off - taking the glass with it.

The reason I clean so often is I am trying for consistency - trying to turn the art of adherence into a science.  I find I can modulate the stickiness very well by changing the extrusion width for first layer parameter in slicer.  For small parts, I go with 100% but for a large part prone to warping, I will dial this all the way up to 200% and it works quite well (as you can see :-)).  The bigger thread holds more heat and has more time to adhere.

I think the problem is the hairspray actually adheres more as it cools so if I set the extrusion low enough to not permanently adhere when cool, it doesn't adhere enough when hot for large prints.  Maybe I should try different hairspray.  I am not using the recommended Aquanet ultrahold  since the generic hairspray at Walmart has been working really well (except for this issue).  I'll find some Aquanet and see if it behaves any differently.

check your PM

No issues with tempered glass and hair spray. I just put it in the freezer after the print and it slides off in about 3 minutes

So you put the entire piece of glass with the parts on it in a bowl of water.  Then but the whole thing in the microwave for ten minutes?

edit: I follow you put the parts with the broken glass stuck to them in the microwave.

Wow! that is some serious adhesion!
just out of curiosity - have you tried reheating the bed at least partially before attempting to pry off the part? perhaps that would help?

personally, I have not had any success with the hairspray, but the glue stick works pretty well for me.

What kind of hairspray do you use?  This is what I use:

I've tried it and it was OK.  I' think glue stick works better but nothing works as well as hairspray on glass for me.