I use a scraper with a single edged razor blade in it.Works best on a cold build plate. Start at a corner. I have wondered if using a can of air for dusting keyboards could be used to cool the bed below room temp to get a release. Never had to try it just a thought.
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I use very thin feeler gauges to slide under the print. I then slide progressively larger ones under the same corner until the Gap is big enough to fit my plastic spatula and pray up on it.
I’m proud to be the only one who uses a hammer on prints 
Lol mallet or hammer?
Depends on the print. Really it’s just Newtonian physics. Taking a print off the bed is like pulling a table cloth out from under a fully set table. With the right amount of force you can make that print move away from the bed without the bed absorbing much force. When the force is properly placed between the part and the bed you don’t damage either.
If you have a removable bed pla prints pop themselves off after 2 minutes in the freezer, I use a use a very particular hairspray for bed adhesion with PLA.
As for abs, kapton tape is the way to go, a careful knock with a rubber hammer or if you can ease a chisel infer a corner that works wonders too.
Some good ideas on here I will have to try feeler gauges and dental floss
Just use this, I was skeptic at first but it turns out to be an excellent tool because the edges have a varying thickness:
http://shop.turtlecreations.nl/3DPrinters/3DPrinterAccesoires/buildtak\_spatula
Oooooh.
When I chipped my 2.0 I just bought Buildtak and have not had a problem. Its just a bandaid lol