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.
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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.