News Engineer turns old 3D printer into a tattoo gun that you definitely shouldn't use at home

Even executing the tattoo required extensive hardware modding the 3D printer and rewriting its firmware, making it (mostly) only operate on a single axis and be able to use a tattoo gun properly.
Does this mean it only works left-to right with no back-and-forth movement, like an old typewriter, which needed a separate mechanism to move the paper up and down?

Mindstab Thrull