AutoCad LT2026 on new PC - PDF prints the same lineweight for most of the lines

[jimmyjamesjimmy]

Hey I've just moved from an old Windows 10 PC running AutoCad LT2023 to a new PC running AutoCad LT2026.
When I print to my physical printer the lines for all items look correct - lighter here and there for lines and objects etc.

However, when I open plot and look at preview or print to PDF, all the lines have pretty much the same weight and it doesn't look good. If I zoom in on the PDF I can see some line weight differences, but if I open a PDF I created on the old PC you can see the different line weights without having to zoom in.
I've imported my ctb plot styles from the previous computer. I tried printing with "DWG to PDF.pc3", "AutoCAD PDF (High Quality Print).pc3" and the Acrobat PDF driver - same result.

Are there some plot settings I need to tweak?
What could be causing the issue with preview and printing to PDF?

[paullimapa]

Could you share the following:
1) Sample dwg

2) ctb (zipped before attaching)

3) Screenshot of PLOT window

4) Screenshot of command ABOUT window

[jimmyjamesjimmy]

Hey Paul,

Many thanks for your reply. I will gather this information send through.

[pendean]

@jimmyjamesjimmy Show us old vs new PDF by sharing each here please, then use ETRANSMIT command in LT2026 to bundle your DWG file with all it's necessary support files to share over here (this will take care of #1 and #2 from Paul's ask),

[jimmyjamesjimmy · Accepted solution]

Hey guys, sorry for the late reply.

In the end I solved the issue by changing the default lineweight for the colours I was using, changing the contrast of the colours and then printing with a different PDF printer.

It looks like the lineweight and PDF printing has changed a little between 2023 and 2026 versions.