Defenitley a milestone, although I'm not sure how someone can copyright a "triangle illusion". I wonder how long it will be before companies realize how much trouble they will be in when people can download pirated designs an print out their own 'stuff'. Is thingverse going to be the new piratebay?

Probably not, since actually took the design down. I wouldn't be surprised to see it show up on the pirate bay though. Interesting times lie ahead.

They posted an update about it as well.

http://blog.thingiverse.com/2011/02/18/this-is-why-cc-licens...