Then the non-discipline objects are printing at quarter-tone, aside from the additional down-toning from this issue. Multiple halftone values multiply rather than override. So if on a mechanical view you mark the link halftone, then walls halftone, then they will ultimately be at eighth-tone. I wish you could override Revit's automatic halftoning of non-view discipline objects.
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We split your post in to its own topic in the Autodesk Revit MEP forum where there is likely to be more active feedback on the topic.