Austrian designer Marc Schuran have created a 3D printable Tattoo Machine.
At first, he tried to build classic tattoo printing machines. They worked very well, so he decided to create this 3d printable model with the software Rhinoceros 5.
There are two 3d printed pieces: the grip and the frame.
The device works pretty good. He tattooed about 10 people with this machine, no problems
STLs and more informations here: https://cults3d.com/en/tool/tattoo-machine