Linework looks good in illustrator but terrible when I print or make a PDF

[Sean23439879boza]

I printed to PDF from AutoCAD, imported into Illustrator so that I could overlay the gray tone shadows and trees on the drawing. 

I'm happy with the way it looks in Illustrator (the attached .jpg) but it looks like trash when I print to PDF (the attached .pdf)

Also looks bad when I print directly from illustrator, the same thing happens with the darker lines and even dropping a lot of the lines and not printing them.

Anyone have any insight? Any help would be very appreciated. Thanks!

[Monika Gause]

Looks like it gets rasterized. Did you put any effects on it?

Printing a PDF is not recommended. What if you save as a PDF?

And it looks like your printer driver just can't work with Illustrator files or maybe is not PostScript enabled. So what happens when you save a PDF and then print from Acrobat?

[Sean23439879boza]

when saving as a PDF, it all of the lines print dark black, or thicker, not preserving the character that they have in Illustrator. ... I attached the example

[Larry G. Schneider]

In the user preferences in Acrobat, is Enhance Thin Lines checked?

[Sean23439879boza]

yes it is checked

[Larry G. Schneider]

Then uncheck it and try printing from Acrobat again.

[Sean23439879boza]

Thin lines helped the display, but it was still dropping lines. I checked the "print as bitmap" option so that it would hopefully be processed by the software, and that seemed to do the trick. Thanks for your help!

[Sean23439879boza]

ok so I unchecked enhance thin lines and it looks way better! Thanks! now all I have to do is figure out why my printer is dropping lines when I print the file. Trying to find postscript settings.