This doesn’t appear to be a tolerance issue. Elementary surfaces, such as these conical surfaces, are represented differently both internally and in STEP files in different applications. Because of this, it is more difficult than you might expect to translate them correctly. In this file, the STEP representation of the interior cone has its natural seam on the left, but the 3D trimming curves are such that the seam should be on the right. We attempt to find inconsistencies like this and take them into account. This particular problem does not get caught for some reason. All we can do is improve our code as new problems are reported. I’ll get on this one ASAP. Thanks for the report.
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