I have a network printer on a Win 98 machine.  I can print to it using
smbclient.  I used printtool to setup a printcap entry for it and tried to
print using it (lpr, Gedit, etc.).  The results are the same in all cases:

[mike@kitchenstadium mike]$ lpr -Pepson .bash_profile
Status Information:
 sending job 'mike@localhost+346' to epson@localhost
 connecting to 'localhost', attempt 1
 connected to 'localhost'
 requesting printer epson@localhost
 job 'mike@localhost+346' transfer to epson@localhost failed
  error 'NONZERO RFC1179 ERROR CODE FROM SERVER' with ack 'ACK_FAIL'
  sending str '^Bepson' to epson@localhost
 error msg: 'spool queue for 'epson' does not exist on server
localhost.localdomain'
 error msg: '   non-existent printer or you need to run 'checkpc -f''
[mike@kitchenstadium mike]$

I think the filter isnt' getting $PRINTER_TYPE set properly by the caller,
because I don't ever see smbclient invoked (although it could be coming and
going really fast).

My /etc/printcap is:

##PRINTTOOL3## SMB uniprint NAxNA letter {} U_EpsonStylusColor stc740p {}
epson:\
        :sd=/var/spool/lpd/lp:\
        :mx#0:\
        :sh:\
        :if=/var/spool/lpd/lp/filter:\
        :af=/var/spool/lpd/lp/acct:\
        :lp=/dev/null:


I have LPRng and rhs-printfilters-1.81-1 installed

Thanks,
mike.