If you look at the matter and form and the einscan - 0.1mm is the stated resolution for small object.

scan something liek aperson and it goes up to around 1mm or higer - which is still a humoungous amount of data to deal with.

And it doesn't take particularly expensive cameras and lasers to get that resolution. But it does require very sophisticated software to deal with the mass of datd and try and decide what's object and what's background.

So yeah at the moment the hardware is cheap and available - the software just needs another generation or so to get to the point that you have proper point-scan & print capability.

One thing it might be worth looking at is an all in one scanner and printer.
the zeus looks pretty good: http://www.zeus.aiorobotics.com/