By Default, Standard Users are unable to add printers in OS X. So your going to need Admin credentials each time you need to add a new Printer to the system. This default can be changed by adding Users to the print group.
Use this command in the terminal to give all users on the system the ability to add printers.
sudo dseditgroup -o edit -t group -a everyone _lpadmin
This command will add a specific user to the Print group, replace “userx” with the user you would like to elevate.
sudo dseditgroup -o edit -a userx _lpadmin
Use this command to add all domain users to the print group.
/usr/sbin/dseditgroup -o edit -n /Local/Default -a 'Domain Users' -t group lpadmin