Pause for a moment and consider that one can purchase narcotics from an anonymised network using virtual money. There's no need to read speculative science fiction these days, you can just read the news.
1) The printer is capable of "printing" complex compounds using individual atoms
2) The printer is pre-loaded with cocaine, LSD, MDMA...
My point being not everything can be printed...
Similarly, in Daniel Suarez's Daemon [2] he describes how a series of net connected people pass around individual parts that they have no idea the purpose of until they all get delivered to one guy who assembles them into a gun.
1 - http://www.amazon.com/Metatropolis-John-Scalzi/dp/B0058M5ZJ6 - "The Red in the Sky is Our Blood"