This is part spinner, part wheel. It uses a 3" O-ring as a tire and is a good spinner, but is also fun to roll across the floor or desktop. Leaning at an angle will make it roll in a circle back to you. And the spiral is flexible enough to act like a spring, so it even bounces. Uses 608 bearing without seals and lube.
Update 3-5-17- Added a 3-arm version of the 3" wheel. Added 3 and 4-arm version of 4" wheel, added a solid center wheel that takes a size 223 o-ring (1 7/8" O.D., 1 5/8" I.D., 1/8" diameter). Also made a pusher that you can use as an alternate means of launching.
Included are pics of part numbers and dimensions for 3 and 4 inch o-rings I got at Ace hardware, if I were doing a bunch of these I would find a source to buy them cheaper in bulk online. I found some 3" o-rings at Amazon - https://smile.amazon.com/gp/product/B0051XZ6KU/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
2 spiral wheels can be combined to make a good optical illusion similar to some other designs I've seen out there, but with bearings for better spinning. I use the small dowels shown in the picture to connect the 2 wheels, available at Ace Hardware, or probably any hardware store.
Videos of the launcher and optical illusion
Use a 3" o-ring for the tire. Did at .3 resolution, 5 perimeters, 3 top 3 bottom layers, no infill, the perimeters make it solid. Transparent Red WYZ PLA at 215 head, 35 bed. Print time 37m:38s. For the 223 version, recomend 100% fill for weight if you want longer spin times.
For the wheel pusher 2.2 5p 3t3b .2inf . The pusher has a hole in the handle to plug in a 3/8 dowel rod if you want to give it extra length. i just checked it, a little tight, running a drill bit through it to clean the seams should make it fit.
The cap in my hand is the one included, I had put other ones in there before I made those. They are better because you get some grip from the grooves. Groovy. Settings for cap are .3 res, 5 perimeters, 3 top 3 bottom and 50% infill. Beware, I have found if I print the caps at .2 resolution they are too tight.
I notice I see noise on the preview pics where the spiral arms join the rim and center, they really are solidly attached, I'm sure this is from the boole I used on them. I tried running one through NetFabb, but the fixed file looks the same. Ignore it, they print fine.