Some people think 3D printing is not a good idea ...

...and they may have some good points. People from Additivism collective focus on general pollution by plastics and critique of consumerist society with more and more stuff being made that severs no purpose ...

Some interesting bits I found in their presentation:

3D printing + spam + micropayments = tribbles
that you get billed for, as it replicates wildly out of control.

90% of everything is rubbish, and it's all in your spare room – or someone else's spare room, which you're forced to rent through AirBnB.

Source: @justinpickard

You can see a more detailed presentation at:

http://additivism.org/transmediale