It doesn't scan in the traditional sense of an office scanner does. This Snapjet doesn't uses a line of CCD to scan a digital picture and then print it on paper.

The kind of scan it does is simply to run a slit along the smartphone. The light from the smartphone that goes through the slit simply illuminates the light-sensitive front face of a Fuji Instax Mini instant film.

What this is doing is neither printing or scanning: it's transferring the image -in the optical sense- directly from the screen to the light-sensitive photo paper.