https://en.wikipedia.org/wiki/Tesla_valve

!Tools
https://www.youtube.com/watch?v=0eGnNq5VafI

https://www.youtube.com/watch?v=TYMRc2ZuATc

https://www.youtube.com/watch?v=B8CJjAOa-D0

! CNC
https://www.youtube.com/watch?v=qab0aceb7uw

https://www.youtube.com/watch?v=TTEhwzCbWMA

! Joint
https://www.youtube.com/watch?v=WFXieuIcPdU