It's a Fidget Spinner that uses 8x M12 nuts as the spinning weight and 2x608zz bearings for the axle. The weight of the M12 nuts feel solid in your hand.

Good bearings are the key to longer spins, but any pair of 608 bearings will work. I used Freesport SpeedDemons (ceramic bearings) from Amazon which work great out of the box. (Many cheap steel bearings are grease packed, and need to have the covers removed and de-greasing with Isopropyl Alcohol.)

I have added the F360 which is fully parameterised in case you need to adjust tolerances for your nuts or bearings. Mine works fine on my P1S printer with several brands of bearings and the cheapest M12 nuts from my local hardware store!