I have designed this version inspired by swords and other retractable models.

I have noticed that depending on the filament the performance may vary. For example with PLA+ from Sunlu I have better results than with CosPLA from Polymaker.
I recommend you to make some tests and do not hesitate to comment in order to improve this design.

Enjoy !
 

Intructions

I recommend printing a part to test the filament.
I recommend using only “strong glue” for the parts. Hot glue can cause problems with the “REAR” part.

Then follow the steps of the image

1. Glue either the toe part or the back part (for the back part you will have to extend the whole claw).
2. Finally align the first claw and glue it to the base of the hand.
   
   Here is a video of me using them 👇