Users are being prompted for Admin credentials when they attempt to print.

Hello! I am a Tech assistant at a public school and we have run into an issue with our students and their MacBooks & MacBook Pros.

Whenever our students attempt to print to any printer in their school building they are prompted for administrator credentials. I have attached examples of the message they are getting:

We are not sure how to go about tackling this issue. We are getting this message on both MacBooks and MacBook Pros. They are all running Mountain Lion. Last year they were all on Lion and we never had this issue. Could this possibly be a known issue with Mountain Lion??? Once we type in the administrator credentials for the students they are able to print from then on. Many of the students are also seeing this message when they try to print at their homes. It seems to have something to do with printing permissions but we're just not sure. Any help would be very much appreciated!

Thanks!