Improve the quality of PDF drawings

Hi users, I’m hoping for some advice here on improving the output quality of PDF drawings.  Essentially I would like to see finer lines & generally reduce the fuzzy edges around the edges.  Smaller items like bolts have the same thickness as structural members, and I’m wondering if line thickness at part level is a solution for this?

I’ve attached an example of my regular settings for output:

  • Display Style set to High quality

  • Microsoft Print to PDF – High quality checked

  • Save As Adobe PDF doesn’t improve the quality, just increases the file size