3D-printed tourbillon, 5:27 video.
https://www.youtube.com/watch?v=bl2oMHIbaFU
Previously:
https://www.homemadetools.net/forum/...3559#post99438
https://www.homemadetools.net/forum/...506#post151260
https://www.homemadetools.net/forum/...948#post124957
https://www.homemadetools.net/forum/...4170#post79461
https://www.homemadetools.net/forum/...321#post103950
