Check with the schools, tech centers, afterschool programs, libraries, and civic clubs, These folks seem to always be looking for some "skill" building ideas.
A couple of guys in my RC club are doing a building and flying seminar to an afterschool program this upcomming year.
A group of us in our model club was asked by an art teacher once to give airbrush demonstrations and instructions to a Three Dimensional Design class. She met me at a model show and was impressed by what we, as modelers, can do with an airbrush.
For you printing venture, let us know your capabilities and requirements. We are always looking for decal makers. However, it seems these stupid copyrights and other legalities get in the way. So good luck.
Scott