Flexi Rex with moving jaws

This is a remix of https://www.thingiverse.com/thing:2738211

I added fun to this toy, allowing it to furiously bite anything :'D

Once printed:
- carrefully brake support in jaw's mechanism, by slowly actionning jaws.
- then just add a "pen spring" behind jaws, and have fun.

Uploading "furious bite photo" is mandatory to be allowed to print this :D