608 bearing that kinda works ok

https://www.youtube.com/watch?v=pRVk6oIPXxE

Works pretty well considering the size. Any blobs or seams that stick out will be problematic. Layer lines also cause "grinding" when pressure is applied but it still rolls. The one in the vid was 0.2mm layer height and .6mm nozzle. Need 10 balls. I printed the balls at 100% infill to keep their shape consistent all the way up. It's fiddly to get it all together but once in is pretty stable. Sorry for my nails in the vid I had just eaten several oranges.

I re-did the original from scratch, all triangles are my own, but the design is basically the same as the one this is remixed from but just scaled differently. All clever stuff, he did, while any problems, I added.