You might already have one, and just don't know it :-) If you don't, it's much cheaper to get one that the author considers a 3D printer.

From TFA:

> 1. I like to think that all printers are 3D, unless it's a printer in Flatland.

It's actually a 4D printer unless it exists for just an instant, or an 11D printer if string theory is correct, or an 8==D printer if that happens to be the value in the variable D.