What the "Z=0" function really does...

[cliffyk]

I have only realigned the platen a few times, after replacing the FEP or the LCD. I found Elegoo's specification of "a sheet of paper" to be a bit ambiguous ("sheet of paper" is not a standard unit of measure) so I found a piece of paper that was 0.15 mm thick (30 lb vellum) same as the OEM FEP. Using that as a spacer I adjust the platen mechanically so as to provide the stated "snug fit"¹ I have played with the "Z=0" setting, but never found any need for it.

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¹- Still a less than precise specification, but better than "sheet of paper". BTW, a sheet of plain ol' common 20 lb bond copy/printer paper is 0.097 mm, some 53 microns thinner than the FEP.