you should stop cups service, then open /etc/cups/printers.conf, modify printer's URI like that smb://guest@....... then save and start cups service. when you start printing authentication dialog pop's up, you don't have to enter any credentials , just hit enter an it will prints
you should stop cups service, then open /etc/cups/ printers. conf, modify printer's URI like that smb://guest@....... then save and start cups service. when you start printing authentication dialog pop's up, you don't have to enter any credentials , just hit enter an it will prints