Always wondered about this - do I just email an news outlet and tell them "my story" and see if they roll with it?
I'm starting to advertise my business around with the idea of growing a userbase before the official release. Ironically enough mentioning a link to it on my previous HN comment lead to more visitors than either of the Facebook or Reddit ads that I put up.
With that said, if you're into 3D printing, see https://makely.me