Neat, and a handy addition for some, but I'll chalk it up to one of those things that I really don't care about myself. Though, be careful if you want to use your 3D Printer to make anything that gets banned - like guns, probably... MS is complicit with government authorities, so, may bite you in the arse.
(side note: Google, Apple, Facebook, etc etc, all in the same boat - MS ain't above it though, for all of their "scroogled" ads they are not defenders of privacy in computing)