My love of all things Metroid demanded it. This print:
I used PETG primarily because I wanted to keep it Prusament Orange and Black. No reason you can't use PLA. Print flat, no supports needed.
If your magnet is an 8mm x 3mm, like mine, print the “bump” spacer. Glue this into the center hole in the back of the spinner, and your magnet on top. If your magnet is thicker, you should just be able to glue it in the center hole directly.
The author hasn't provided the model origin yet.