system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are there no tattoo 'printers' ?
gpt
There are no tattoo printers because the depth into the skin to place the ink, the elasticity of the skin, hydration, muscle tone, and scarification of the epidermis are all variables that tattoo artists take into account and compensate for while executing a piece. There's also bleeding versus clotting, edœma, allergic reactions, vein placement. 

It may be possible to design and implement state-of-the-art medical robotics that take all these into account; the means to afford that is beyond most tattoo shops, and the means to operate that — including licensing, insurance, maintenance — is prohibitive. It would be something used by cosmetic surgeons.