Maybe a long shot. Theses are 3D printed badges that are held in place by a couple of magnet, shown here open. Each part are made of a single uninterrupted print, the magnet is inserted afterward, exploiting the elasticity of the plastic.

At one point I had the 3D model for the black part but I lost it. I tried to search it but no such luck :( If amyone could help that would be nice