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I don't know how well a ceramic tile will function as a heated bed. I'm guessing quite spectacularly badly
Actually, it is probably one of the best beds to use. As a great discussion on another board, it is explained like this: The more heat conductive a bed material is, the worse it performs due to cooling too fast when the print is over. If the material is thermally resistive, then it takes longer to cool down, and helps eliminate edge curling on larger prints. The downside to ceramic tile is making sure to use a glazed one for flatness, and the fct that since it is thermally resistive, you need an adequate heater.
