This is an IMPACT ACTIVATED flash bang, 

 Hot Glue case to the body, add other components, the last thing before you throw it is insert the shell and pull the pin and throw          

 !!! I TAKE NO RESPONSIBILITY IF YOU BLOW YOUR FINGERS OF !!!  

Enjoy



0.2 layer height 

5-6 shells

@ 5% infill should be enough

the .22 conversion only works on the fallout CANISTER https://www.thingiverse.com/thing:1525507/#files

NOTE: THESE GRENADES SPLIT IN HALF ON DETONATION SO AS TO MINIMIZE FRAGMENTS AND INJURY ! (The shell holder is disposable and can not be used after detonation)



Springs: https://www.ebay.co.uk/itm/Wire-diameter-1-0mm-OD-4-3-to-22-8mm-Miniature-Torsion-Spring-Select-size/273301293537?hash=item3fa206c9e1:m:mRVK7xyqLD4C3fwwvCjzcXQ:rk:12:pf:0



!Don't forget to check out my other designs and Follow my weekly KooKoo uploads, Enjoy ;