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First test with 0.8mm nozzle. Curiously less warping than 0.4mm nozzle. Different kind of defect, where the waves don't fully reach the perimeter.

On the flange the gaps between the holes and the edge are too small to wave through. Some warping also.

https://www.thingiverse.com/thing:2151369/

Slight warping

Good except for warping

Very low perimeter quality due to extremely low layer time.

Zig zag behaviour unexpectedly stops towards the end of the overhang.