Most of the time when I now need a 2D item, I use a Web-based service and have it delivered. For example I use Web-based services to to print photo albums, greeting cards, business presentations, signs, etc. I do so because the resulting quality is better and cheaper.
I suspect if I ever wanted some 3D item printed, I would do the same.
Adjustable camera mounts for my computer vision projects...a tablet mount to hold my tablet at a particular angle while I'm lying down and reading... better supports for my old arthritic dog...cat toys...waterproof cases for my embedded projects and sensors...chassis for small robotic vehicles...
https://plus.google.com/+HenrySegerman/posts/FGZdWSM2qET
http://www.shapeways.com/product/R8B97GHZN/3-club-cascade-mo...
http://www.shapeways.com/product/3UEJKYME9/3-ball-cascade-mo...
[1]: like they said. It will make the better world :D