Cool use of bearings, in a 3D printed watch!

Bearings are often used in clock making & here's a beautiful, 3D printed example,
]created by Nicholas Manousos.

Of the bearings, Nicholas says:
"The ball bearings are the only movement part not made in house. At the large scale I work with it makes most sense to use ball bearings rather than traditional jewels. I experimented with printing jewels using high-strength polymers with acceptable results but found ball bearings to perform much better".