I'm going to guess your situation is a lot more common than RaphiePS'. I know quite a lot more than 15 people, but not 15 who live in close enough proximity to

I'm going to guess your situation is a lot more common than RaphiePS'. I know quite a lot more than 15 people, but not 15 who live in close enough proximity to make this work and who are also likely to be interested in co-oping on a 3D printer. In any case, 15 sounds like a bit of a logistical nightmare even if you did have that many people in your local friends circle interested enough to go in for a 3D printer.