608 bearing (4.5mm steel BB's)
thingiverse
Human: 608 Bearing from 4.5mm steel BB's. Size: 8mm x 22mm x 7mm. Video: https://youtu.be/g3sQjzVYf7s Actually, the diameter of the balls is about 4.4mm. After printing, carefully disassemble the part, remove burrs, assemble, and tap with balls. With a separator, the bearing rotates much longer. If you don't install the separator, it's easy to disassemble the bearing by pushing out the balls. I think the bearing turned out great :). Update 2018.06.02 At skitcher's request, I added a couple of projects for bearings with 4.0mm balls, but I didn't check them because I don't have those balls.
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