I haven't found that option in my version. Not exactly sure where you found it though. Odd part is that the floor plan works fine. Its only the exterior elevation views that has inconsistent/low line weights and that is only when you try to print it. Every screen before you print looks fine and isn't till you see the pdf or printed page its grey.
Have a ticket in for it at the moment.
I'm having the same problem. I would be interested in the solution to this problem as well.
Printing to PDF too light
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I'm having the same problem. I would be interested in the solution to this problem as well.