I have put together a script to be run as a policy via self service which temporarily adds the user to the lpadmin group so they can print and then removes them as after printing once the problem seems to go away. I'll post it here but be aware although it appears to work in testing I haven't had the opportunity to try it out on my users...
#!/bin/bash
###############################################################
#
# Script to fix 13.4 requirement
#
# 'Printer Proxy is trying to modify the Printer settings'
#
# by temporarily elevating user to lpadmin group
#
# by Antony Nelson
#
# Known limitation, if the computer is reboot during the
# script user elevation will remain
#
###############################################################
CANCEL=`echo "button returned:Cancel"`
YES=`echo "button returned:Yes"`
answer=`/usr/bin/osascript <<-EOF
display dialog "Following this work flow will solve the 'Printer Proxy is trying to modify the Printer settings' error when printing. Please follow all instructions carefully." buttons {"OK", "Cancel"}
EOF`
if [ "$answer" == "$CANCEL" ] ; then
echo "User clicked Cancel"
exit 0
fi
loggedInUser=$( scutil <<< "show State:/Users/ConsoleUser" | awk '/Name :/ && ! /loginwindow/ { print $3 } ')
sudo /usr/sbin/dseditgroup -o edit -a $loggedInUser -t user lpadmin
answer=`/usr/bin/osascript <<-EOF
display dialog "Please print a document now." buttons {"OK", "Cancel"}
EOF`
if [ "$answer" == "$CANCEL" ] ; then
echo "User clicked Cancel"
sudo /usr/sbin/dseditgroup -o edit -d $loggedInUser -t user lpadmin
exit 0
fi
answer="No"
while [[ "$answer" != "$YES" ]]
do
sleep 120
answer=`/usr/bin/osascript <<-EOF
display dialog "Have You printed a document?" buttons {"No", "Yes", "Cancel"}
EOF`
if [ "$answer" == "$CANCEL" ] ; then
echo "User clicked Cancel"
sudo /usr/sbin/dseditgroup -o edit -d $loggedInUser -t user lpadmin
exit 0
fi
done
sudo /usr/sbin/dseditgroup -o edit -d $loggedInUser -t user lpadmin
echo "Work Flow completed"
exit 0
