The whole 3d printer craze is interesting, and I wouldn't say no to one in my house or garage by any means if someone else were paying for it.

Lets see if I can express my metaphor right. 3d printing is to machine shop as photoshop/epson inkjet is to darkroom.

If you're willing to learn some practical skills and have some old heavy equipment take up space, you can do better than the bleeding edge equivalent, and for less $. You can make real camera, real guns, real lenses. All with junk you bought on craigslist/ebay that was taking up someone's garage space. Just like darkroom equipment.

The end result product will be one of a kind quality craftsmanship rather than 1-100 copies of the same thing just like the computer said.