There are a number of things that could potentially be damaged operating the OT2 at 100% humidity. For example, 100% humidity is outside of the manufacturers suggested operating and storage environment of the stepper motors. There are other components that could also be subject to damage, though we can't say specifically what since we have not tested in that environment. All in all we wouldn't recommend doing so, and can't guarantee that the machine would operate well in such an environment. 

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