It has happened to all of us, to take the part off the printer and see that it is very difficult to separate them. Be careful with this, as applying excessive force can damage the mechanical parts of the printer or the bed itself.
The best advice in this situation is to use a strip as a build base. Today most printers have one or they can be purchased from the usual hardware stores. A strapped base is one of the best updates you can make to your 3D printer. With it, once the printing is finished, you will only have to bend it slightly so that the piece peels off easily.
If you still do not have this type of printing platform, we leave you with some useful tips:
Slightly round the bottom of the models you are going to print to make it easier to separate it from the bed.
Use a flat spatula to remove the piece, do not use force with your hands or you may damage it.
If you've used lacquer, spray the base of the piece with water and wait for the lacquer to dissolve.
If you use hairspray and experience these problems in common, consider reducing the amount used.
Cools the build platform
Make sure you are not printing the first layer too close to the build plate.