The stock heated bed which came on my Creality printer is significantly warped beyond any simple leveling with the screws. Lets say I want to upgrade the stock bed to a premium heated bed, does such a thing even exist? None of the beds I see list any specs or tolerances regarding flatness or deviation.
What should I be looking for to ensure I am looking at a superior bed?
If you are only trying to upgrade the "flatness" of the bed and are okay with the heating times you can just put a peice of glass on top. Otherwise you can look into getting a milled tool plate which will be much flatter than a rolled or stamped plate, but you will have to attach your own heating element to this.