If changing printer settings no longer works because the system starts requesting the lpadmin password try this command in Terminal:
dseditgroup -o edit -p -a admin -t group _lpadmin
This adds the admin user back to the lpadmin group and changes should then be possible.
I usually write a blog post about once a week. The latest post can be viewed here: I Support Religion!: I can see that the alternatives are often not good! (posted 2024-09-20 at 12:04:19). I do podcasts too!. You can listen to my latest podcast, here: OJB's Podcast 2024-08-22 Stirring Up Trouble: Let's just get every view out there and fairly debate them..