200 mm. Hamster wheel

I have tried many size of barring then decided to use 2X 6000 barring with M8 X 70 mm shaft and 2x printed bushing for each barring. Because 608 with M8 does not perfect fit and will create some noise.

Bolt head cover is not necessary, I just add this part as my friend request. I make a space to drop-in 6*3 mm. button  magnet. You can add command "M125" (park tool head) at layer 46 to insert magnet .