Massive long duration spinner

This is a heavy weight spinner that can still fit in your hands. Due to its mass, it can spin for a very long time. Check out the video below to see how nice this spins! I get in excess of 4 minutes with it. It uses 9 bearings, and comes in two versions.

First version: This model is the same height as your standard 608ZZ skateboard bearing. You can use it with any center cap you'd like. You'll need:

Print one copy of "standard spinner height.stl"
Buy 8 ball bearings, this is what I use: h