UPDATE: Some are saying that they are not getting sizing when pulling into the slicer. I'm not sure why that is. If anyone has any ideas, please let me know. I exported the STL's from Fusion the exact same way I printed them myself. No resizing required. Check the images for a dimension so you can get your scale.

UPDATE: I've added an extended shaft to accomodate 10 wheels for more complex math.

I created this based on a spinner (cited) that I liked but didn't like that I needed a PVC tube to complete the build. I also wanted to make sure there was a tactile feel when spinning the wheels. This is for my son who is almost 4 so it's as much a fidget toy as it is an educational piece. I didn't leave any clearance on my cap so it's a nice snug fit. If yours is loose, a little drop of glue would keep it in place.

Printing: No supports are needed, just make sure on the wheels that you make sure the shaft tab is on the bed. I ran these on an Ender 3 with a CHEP (good) profile.