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I was using Ender-3 Pro's CMagnet bed but I switched to glass bed (because original bed is warped) and left the magnet base (not the bed itself but the glued bed which CMagned sticks) on heated bed. So now it's 3 layered (heated bed - magnet bed's base - glass bed) bed.

Should I remove this magnet bed's base and put glass on the metal heated bed directly. Or it's not that important?

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The more layers, the higher the temperature you need to set the heated bed to reach the same print surface temperature as before (air is an insulator, so when entrapping air between your layer you insulate the heated bed).

I do not know the weight of the magnet base, but, keeping adding weight is not a very good idea unless your bed goes up and down (movement in Z direction is generally much more slower than in Y direction), but the Enders 3 bed goes back and forth. The more mass the axis needs to displace the less accurate the print.

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