I know you can put a piece of glass over the metal bed, but I was wondering if there was anything else? I have a rather small print volume and didn’t want to lose that much on my Z axis.
if possible mesh bed leveling, this is available in the Marlin firmware. if you google this it essentially compensates for the warp in the bed by moving z axis up and down slighty as nozzle moved across bed. The easy answer is glass or a mirror, the glass can be only 2-3mm thick so shouldnt make a drastic difference to build volume. you could always tighten your bed leveling nuts down more to compensate for the height loss
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