It's not going to get rid of economies of scale or mass production.

It is going to open up mass production to more people. Shorten the speed to market.

Essentially as think of the ease with which a web page can be updated, so can 3D printing and its ilk.

However do not mistake 3D printing from removing factories anymore then home printers removed industrial printers. Nor think that everyone will become an artisan maker anymore then laser printers made everyone a published author.

It will level the playing field and allow smaller more dynamic outfits to get their designs out there. They still will use mass manufacturing... But it won't rely on their direct capital, it will be a pay per item model.