For folks just wish to replicate something, probably also need a 3D scanner!
I think most people probably don't need a printer at home. Only for rapid prototyping companies that need to iterate components need to have a printer close by... for most of us amateurs, I think it'd be cool if we could simply take multiple angle shots of an object... specify how big we want it and what kind of color material we want... and then just have it mailed to us.
Do you think you can create an app for that MR2?