I first saw this basic design as a sticker. Figured it'd make a good Christmas gift so designed it up in OpenSCAD and printed it in PLA on a Prusa Mini.
I modelled in holes so it could be hung from a string as well as 6 voids (for 2mm thick, 3mm radii) magnets. The openscad design depends on the roundededcube library and the Liberation Mono font (github home, easy download from blogfonts).
The fuckwits-sign-sliced.3mf is a save of how I sliced the file with color changes and magnet placement on key layers. I also opted to iron the raised text (but not all top surfaces) using a selection modifier.
The author hasn't provided the model origin yet.