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Support Base paper thin

What would cause the base on the supports to become paper-thin? Just updated the Preform software, just updated the printer software, new resin, new tank, trusty old build platform. Using Mini Rafts. I have always had a thinner base than what is in Preform, but always substantially thicker than what I have now. Thought/suggestions

The “Z” reference must have shifted. Maybe the new tank sits a little “higher” for some reason.

There’s an offset adjustment for this kind of issue, in Preform supports advanced settings. " Z-Compression Correction".