We've got several 3D printers at the Make offices and they are in near-constant use. Here's a neat 3D flexible bracelet (source file here - thanks, John!) that I saw on the workbench. I'm not sure who printed it, or if it really is a bracelet or a component for a mechanism. Whatever it is, I like it! Check out Make's Ultimate Guide to 3D Printing here.
3D printed springy bracelet
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects