Try disabling the chamber exhaust fan for large PETG prints. I have had to do this to prevent warping with large PETG prints. H2D seems to think a cool breeze over your print is helpful but I don’t agree if it causes warping. If chamber temps get too high, crack the front door a tiny bit. I usually let my chamber get up to around 45 and open the front door a crack to keep it from climbing too high.
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