Hi Daren!
Are you sure that the printer models are indeed in the content, and they are not custom fields or categories or tags?
I believe they might be stored as a custom field or tag or a custom taxonomy list, because the search would find it in the content for sure.
Try to enable the search in terms option, it will help if the printers are stored as tags or terms: http://i.imgur.com/t0HK3GP.png
