I have 9 supports along the leading edge, but I’m guessing I must not have had enough. Do I also have an exposure problem?
As an aside, I see there are also two large cracks along the “leading” edge. Thoughts? (EDIT: I didn’t notice when they appeared. It might be post-cure but I don’t know).
The only thing I can suggest is add thicker supports right on the corners. I have had similar deformations and that solved it. Looks like the peeling force popped a couple of supports and the surface reconnected as it was lifting out of the vat.
FWIW, I thought I would add another axis tilt, so there is less unsupported length being printed in the initial layer(s). When I do that, look at how few supports it thinks it needs:
I don’t have enough experience with this to know, but somehow that just feels wrong. I’m going to add a whole bunch more supports just in case.