To close it you would just push those grips and to open it theres a little piece meant to be a little elastic.

However, i must say that it has not been tested since i dont have currently access to a 3D printer. Id love to recieve some feedback on any problems you have printing this, such as the elastic part maybe being too rigid or snaping, or the gripper not being confortable.

Even though its meant to be printed as a single print I will also upload each part on its own.

Anyway I hope you like it.