UPDATE Another member pointed out that my models weren't perfectly on the bed in the design, which most decent slicer programs would point out to you and/or automatically correct. So I put them on the bed and re-uploaded everything.

UPDATE
If you find these fidget spinner buttons well designed and useful, please leave a $1 tip to encourage me to create more. I'm happy to redesign these for any bearing size. I also have a project in the works to create a Fidget Spinner Customizer. So you can put in the size of your bearings and a few other details and it will create a 3-5 arm fidget spinner automagically.

UPDATE
I noticed a problem with the sizing of the female portion of the 607 bearings. So I've adjusted it. They are now at mk1.2. (Previously at mk1.1).

UPDATE
I've added 607 Bearing Fidget spinner buttons (caps) to the mix. They are at mk1 and are currently untested until my 607 bearings arrive. But I based them off of my 625 bearing fidget spinner buttons so I have great confidence in them working fine.

UPDATE
I've updated the 625 bearing fidget spinner buttons to mk3.1, I had to add a small ring to keep the buttons from interfering with the spinning of the bearing.

UPDATE
I increased the tolerance on the press fit so that they will now press together easier, and possibly come back apart again without breaking. I also added a medium size to the 608 series, and made several adjustments to the 625 series. All FS Buttons are now at mk3.

UPDATE
I increased the concavity on all the buttons so everything is now at the mark 2 or mark 2.1 version.

UPDATE
Due to the apparent popularity of my fidget spinner buttons, I was inspired to redesign these with a higher face count so the MK2's are now smoother and have bevels. I also added standard sized Spinner Buttons and labeled them both for the 608 bearing. I also included 625 bearing fidget spinner buttons.

I've been obsessing about fidget spinners lately. I've made more than 20. I like the buttons for them to snap together and have a concave surface. It's a tactile thing. While there are other fidget spinner buttons here that meet both of those requirements. They are all too big and cover over the really nice ceramic bearnings that I got. So I designed these from scratch to be concave, snap together, and not hide the workings of the bearings.

I print these out on the Zortrax that we have in the shop. It gives great detail and need almost no finishing on the pieces. I print these in ABS, PLA isn't sturdy enough to print
Fidget Spinners that will last. I recommend you use at least ABS or a higher grade plastic to print all your Fidget Spinner buttons and accessories.