Printers and Roaming Profiles

I have three CAD computer classrooms and several printers/plotters in each classroom. I setup all of the CAD student accounts with roaming profiles. Right now the students are setup for all of the printers in all of the CAD rooms. How do I make it so that when a student is in room #1 they only see the printers in room #1 and so on? Can I also make it so that the default printer changes depending on the room they are in?