Note: I have a newer, smaller version using R188 bearings : https://www.prusaprinters.org/prints/150148-r188-tpu-popit-fidget-spinner
Popit Fidget Spinner.
Requires a 608 bearing in the center.
Bubbles are printed with TPU. Shore 95A works, but 85A works much better.
The bubbles fit flush inside either side. Then apply glue to the holes and snap together. Insert bearing, then put buttons through center.
The author hasn't provided the model origin yet.