Correctly defined /etc/printcap entries created with printtool stair-step when ASCII text is printed.
This cannot be a LPRng problem, moving it to rhs-printfilters. Could you run (as root): rpm -q LPRng rhs-printfilters > foo cat /var/spool/lpd/lp?/*.cfg >> foo (obviously inserting the right thing at 'lp?' and then attach foo?
What does 'file /etc/printcap' say? Things like this tend to be oddities with 'file'..
THis bug has not recieved additional information, and printtool is being replaced. Closing wontfix.