Cannot connect to local printer share

I have 3 users that are setup to share their local Lexmark 520T printers. However, when i try to connect to their share by accessing their computer using UNC path \\computername\printername failed. The error I got was “could not connect to the printer. You either entered a printer name that was incorrect or the specified printer is no longer connected to the server.” I have tried everything. The only similarity with these 3 computers are the printer folder is missing when connection from the UNC path. I don’t know if this help. Please advice…thanks in advance.