Printing without authenticating

[H. Wade Minter]

Another quick Samba question:
I've set up 4-5 shared printers.  The smb.conf section on them looks like
this:

  [las7]
    comment = HP LaserJet 4siMX in S181A
    path = /var/spool/samba
    postscript = yes
    printer = las7_direct
    printable = yes
    public = yes
    writable = no
    create mode = 0700

I want people to be able to print to these printers without having to
supply a password.  I've got the guest account set up in the global
section:

   guest account = guest

Printing is fine once the user authenticates to the samba server.  Is it
possible to have samba print as guest if the user does not authenticate?

Thanks,
Wade