AD Printers – help!

We are trying to configure 2 ICT Suites so that when students log into room1, they can use ‘R1-EPSON’ as their printer, then when they log into room2, they can use ‘R2-Epson’. Have been using CON2PRT.EXE from the ZAK. Only got it to work if you either reboot machine or log in twice. Being a school thats a waste of lesson time!. Is that a better method?. Both printers are from the same printer server. Should they log in elsewhere, then preset local printer should be used