I VOID WARRANTIES
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/1NTL5vpaeC0
I have not tested this. I have a T Shirt that I got as a present a few years ago that has something similar printed on the chest. I wanted something that could be attached to a cubicle wall.
This item has a recess in the back that is sized for a small neodymium magnet sized 2.95mm x 7.95mm.
I printed this in black PLA and then swapped out to white PLA as the letters and safety bits started to print.