From my experience, it looks like a support issue. I think the thin wall is deforming when the printer peals a layer. See this post:
I would try your test print again, but manually add a grid of 10mm spaced supports to the entire slopped side.
From my experience, it looks like a support issue. I think the thin wall is deforming when the printer peals a layer. See this post:
I would try your test print again, but manually add a grid of 10mm spaced supports to the entire slopped side.