For whatever reason, the top piece warped despite what appear to be basically perfect supports.
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The supports are only lightly connected to the object, to make them easier to remove. The force being exerted by the plastic as it cools is stronger than the light connection to the supports, especially over such a large area.
Probably there is a draft causing it to cool to rapidly. An enclosure, even just a cardboard box around the print area, would help.
Maybe, this is in an enclosure though, so that seems fairly unlikely
OK, interesting, no draft. Is it PLA? Is the chamber being actively heated? What is the printer model?
Sorry I should have thought to lead with that. It's a prusa xl, in an old creality enclosure. It isn't heated but stays pretty consistent. This is eryone pla