Spherical flexure joint

Found this:
https://www.youtube.com/watch?v=DAngcygU7tc
thougth It was kind of cool and a nice exercise to improve my CAD skills.
This is the result
https://youtu.be/wASpQMGZQ70

-----UPDATE I------

Johnrandersen made a pen for it:
https://www.thingiverse.com/thing:4837380

-----UPDATE II------
Added a "pen" made from Johnrandersen's model. It's a litlle bit shorter, the tip
is a litlle bit sharper but it requires support. If you want a easier one to print go and
check out his. (It may need scaling)
Also added a long exposure photo.


-----UPDATE III------
Jelle Roemmers, one of the resarchers who came up with this uploaded
the CAD files:
https://www.thingiverse.com/thing:4841850