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The only times that I have ever seen a heated bed on a 3d printer is if the printer is using ABS plastic. PLA doesn't need a heated bed and choosing which plastic you want to print with depends on if you need a heated bed or not. Also if you are building one and are wanting to print both then get the bed to have a switch to enable or disable the heated bed (weather printing ABS or PLA) because PLA has some trouble sticking to the heated bed.