This is a great hint and works really well. I have one problem though - the owner of the file stubbornly remains as root. I have checked through the tail end of the code and inspected the logfile but no avail. The log file shows $2 as my corrrect username. The chmod step works fine, $2 is obviously !="" so can't understand while file remains root:staff. This is really relativly minor but a real annoyance! I see this problem has been reported previously.
Any advice?

This is a little late, but change the chown line to:
/usr/sbin/chown $2 $OUTPUTFILENAME

Apparently /usr/sbin isn't in the printer thing's $PATH.