3D Printing, Here I Come!

Last night was my first of 3 sessions learning about 3D printing at Math for America with George Hart. I've been looking forward to this for so long!

We got to watch a 3D printer in action, and after a Mathematica refresher, we started playing around with attempting different challenges. Now I can't stop trying to design something fun. This is addictive. Any suggestions?

I wish I could make ALL OF THESE!

Of course, if I get good at it I'll probably want to have my own 3D printer. I'd love to hear about your experiences with different brands, opinions about cost and/or materials.