These are magnetic pins modeled off of the cookie cat ice-cream sandwich from the popular TV show Steven Universe.
I 3D modeled them in fusion 360. there is a small cavity internally that is the size of a neodymium magnet. one layer from the back of the 3D print, the magnet is still able to hold up the cookie cat pin to a thin layer of clothing. Although the pin holds well in a static environment, the pin will not stand up to a vigorous workout.
Materials
3D model
FDM PLA filament
Magnetic pin back
I also made a pin in the same fashion based off of the cake icon from the popular video game Portal.
