Illustrator will not print at maximum printer resolution

[tomcolson]

I'm having trouble printing at high resolution from Illustrator.

I cannot print at the 600dpi x 600dpi maximum output resolution of my HP Color LaserJet MFP M283fdw. If I take the same file, save it as a pdf, and print it from Acrobat, the output is higher resolution. Likewise, if I export the art at 600ppi to a PNG file and print from Photoshop the output is also higher resoltuon. The image below shows the issue. System info also below.

I tried to attach both files I printed to create the image below but the website won't allow me to post the .ai file, giving the error "The attachment's illustratorpoorprintquality.ai content type (application/postscript) does not match its file extension and has been removed." No idea what that is about. I didn't change anything in a fresh install of AI before saving the file with the default options.

I've investigated every setting I can inside Illustrator to no avail. The "Printer Resolution" box in the Output section of the print dialog is greyed out so I can't change it.

Any sugggestions as to where to go from here would be greatly appreciated.

Tom

_______________________________

System info:

MacBook Pro with Apple M1 Max running MacOS 12.1 (Monterey)

AI version 26.2.1

AA version 2022.001.20085

Printer: HP Color LaserJet MFP M283fdw

Print driver: HP ColorLaserJet MFP M282-M285-Airprint

Print driver version: 2.0

[Monika Gause]

Does the printer support PostScript?

[tomcolson]

The spec sheet claims "HP postscript level 3 emulation"