Do you have slides you would like to be able to view or print? This article shows how one library was able to use their microfilm reader to both view and print slides. It may only work with some models of microfilm readers, but it is a nice additional service that could be offered.
Microfilm reader or slide projector
Read more at the Swiss Army Librarian: http://www.swissarmylibrarian.net/2013/11/23/reference-question-of-the-week-111713/