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I have had this issue before, not having the objects merge solved the issue, any chance someone could explain why that is the case?

I'm trying to make a pvc elbow but combining lofts or sweeps seems to get me all sorts of errors. This is how it shows the second sweep preview (i named the file incorrectly) This is what it looks like when it is complete, no errors and it is not hidden I tried loft as well Geometric...