Pretty obviously connecting your printer -- 3D, 2D or whatever -- to the Internet is likely not to be a wonderful idea. The problem is that the vast majority of computer users are quite incapable of configuring network enabled devices "safely". My guess is that maybe 4% think they can do so and that less than 1% actually can. I'm no stranger to networking, but I doubt my wireless printer or any other device I've set up is actually "safely configured". Personally, I consider myself lucky if I can manage to get the bloody box to work.