Pull-to-Shrink Snap Mechanism

Pull-to-Shrink Snap Mechanism (Braess’s Paradox)   

   After watching the Veritasium's video about this mechanism, I printed several of them, but none of them worked. So I decided to make my own version. 

   After many prototypes, I created some parts that work, a custom print profile and adapted the printing settings for TPU 85A. I created this mechanism for TPU 85A, I don't know if it works with other types of TPU (someone also printed with TPU 95A and said it works perfectly, so it should print with any kind of TPU between 85A and 95A), but this is the filament from Bambu Lab with the best flexibility, and it works flawlessly with it. The parts that connect the flexible parts are printed in PLA. If anyone tries with other types of filaments, I'm waiting for opinions and possible new print profiles.

   To print as efficiently as possible with TPU 85A, I suggest you insert the filament directly into the extruder, not through the tube, this being a big problem that I faced at the beginning, also use the Textured PEI Plate. I calibrated the rest of the settings for you :))). 

  If the mechanism does not shrink at a moment, try to change the printing temperature of the Short_Part parts (from 235C to 240C or to 230C), because I noticed that the temperature influences their hardness.

   Here is the assembly mode:

Here is the video that inspired me: https://www.youtube.com/watch?v=-QTkPfq7w1A&t=1143s