Can't get the standard cupsaddsmb command to run on a Samba PDC? Are you asked for the password credential again and again, and the command just will not take off at all? Try one of these variations:

root# 

cupsaddsmb -U MIDEARTH\\root -v printername

root# 

cupsaddsmb -H SAURON -U MIDEARTH\\root -v printername

root# 

cupsaddsmb -H SAURON -U MIDEARTH\\root -h cups-server -v printername

(Note the two backslashes: the first one is required to “escape” the second one).