Back when Motorola revealed that it’s seriously trying to bringmodular smartphones to the masses, it left more than a few of the particulars shrouded in secrecy. Granted, that’s probably because most of the particulars haven’t even been fleshed out yet, but the Google subsidiary is slowly starting to reveal its vision for how these crazy things will actually be made. Their approach? 3D printing, and lots of it. Motorola has just announced that it’s locked up an exclusive partnership with 3D Systems that will see that printing pioneer producing “Ara smartphone enclosures” and the nifty component modules that snap onto the phone’s main body.