ISOMETRIC & SHADED VIEWPORT PLOTS HORRIBLY PIXELATED - HELP!!!

[senorwillburr]

I am a student using AutoCAD 2022 Student Version to complete my semester project.
I am trying to display a 3D solid drawn in model space through a layout viewport.  The viewport is set up with an isometric model view and with "Shaded" as its visual style.

This is the SW Isometric - Shaded viewport in paper space, which displays perfectly:

No matter what I try, all the contents of this viewport, including the object & dimension, print in extremely low quality / very pixelated, while the other 2D Wireframe viewports print with excellent quality.

This is the same area of the drawing in the DWG to PDF Plot Preview, which displays horribly.  (Note the high-quality Paper Space M-Text view tag at the bottom, which prints perfectly):

This is a Top - 2D Wireframe viewport of the drawing in the same DWG to PDF Plot Preview, which prints perfectly:

These are the Plot settings:

These are the PDF Options:

This is the overall layout of my DWG, for reference only:

Is there a workaround to have this viewport print in high/presentation quality, just like it looks in the DWG?
Please help ASAP, since the project is due July 31st.
Thanks,
William

[TheCADnoob]

Im unable to duplicate your problem. 

Have you tried using a different PDF printer?

did you do anything to the PDF after printing?

What program are you using to view the PDF? The raster images some times take a second to refine when I view the PDF. 

[paullimapa]

What I try and do is stack a vport on top of another...one will have the shading and the other will have the legacy hidden turned on to give a better edge to the shaded object.