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I tried to add a HP PhotoSmart 7350 printer in CUPS web administration on OpenBSD 5.2. It always returns an error about the printer description. CUPS says the printer description must be only up to 127 characters, and contain no spaces, nor '/' or '#.' (though the example description has spaces!) I tried with underscores, a null string, and one string of letters only and am always getting this error. I have heard of other people having this problem with letter-only strings.
I solved the problem, or a similar one. I maybe had the wrong URI, then when I added it, it said the printer name had an error, so I followed instructions and the printer added. That gmane link above is about versions at least six years old that are not in OpenBSD 5.2, but the newsgroup they are in could be helpful.
I am having some more printing problems. When I checked there were cartridges and paper and tried a test print from the server, CUPS admin said the following.
This update fixes the following regression:
A missing "\" at the end of a line in /usr/lib/cups/filter/pstotiff causes this
whole filter to fail, resulting in not being able to print on at least
Photosmart 7050. This was reported  by Thomas Lottmann and has now been
Found this here: https://bugs.mageia.org/show_bug.cgi?id=2816
I opened the pstitoff file mentioned in my error message, but it does not even contain a '\' character like the thread you linked to mentions. One of the lines it mentions is blank in my version, and the other it mentions does not look like the type that should have a '\.'