Spherical flexure joint
thingiverse
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
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