When you create a PDF or print, you may encounter poor quality images and text.
To resolve this, Ensure to uncheck the "Plot object lineweights" option in the plot dialog box. Also, use the "monochrome.stb" pen style table.
To create the .stb,
Download the monochrome.stb file from the link monochrome.zip and
replace the existing file at the following location.
“C:\Users\Username\AppData\Roaming\VEST\HyDraw CAD<version>\R<version>\enu\Plotters\Plot Styles”.