I made this keychain impact mini grenade for the updated version of the v1. you can see assembly from the pictures. 

Hardware:

-m4 x 12mm screw

-m4 nut

-m3 x 23mm screw

-m3 nut

-a spring: right now I have a spring with dimensions 8mm x 33mm with wire diameter 1mm

-a cotter pin

-keyring

-10mm piece of a lighter spring

(These are what I used most recently, but I recommend you to test different springs and screw lengths)

Filaments:

-For the newer (green) version 

-spoon: light gray pla+

-Body: Bambulab olive green abs

-Other parts: Bambulab black pla basic

What I recommend:

-Does not really matter too much

- Pla+ is the best for this i believe

Let me know if there are problems with it.

If you like add a rating. Thanks!