Disciplinary example assignments using 3D printing

I'm attempting to make a comprehensive list of uses for 3D printing in all academic disciplines. I'm trying to answer the question, "What could a student design and/or 3D print as a meaningful assignment/learning experience? in Art..., in Biology..., in Business..., in Chemistry..., etc

I've got the list started here. I need your help. Please send your suggestions and examples.

http://mylearningproject.tumblr.com/...of-3d-printing