Duplicate printers shown / difficulty with OS X printing

In versions of OS X 10.10+ and later we have seen the following behavior:
A computer querying for printers via Wide Area Bonjour will not recognize that a cached response and an authoritative response are in fact the same printer. (Correctly do a case sensitive compare)
-One will appear as lower case (cached)
-One will appear as upper case (authoritative)

The result is that a user will have difficulty adding a printer. Typically once a printer is added a user is then good to go.

The easy solution:
RENAME PRINTER IN PRESTO UI so that the name is all lowercase.

You may also:

1-Leverage mDNS / Presto Extenders via Direct IP

2-With uDNS Flush client cache. This should allow you to add a printer.

Open a Terminal Window:

sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

After successfully adding, users are typically able to print without issue.

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