I couldn't find anything that fit my interests and I had a bunch of old firecrackers laying around so I made this. It's a simple Firecracker grenade that explodes into little pieces. 

Things to Note
> Have only tested the model with black cat single firecrackers. Change the wall loops or infill if it doesn't work for other types.
> To get the firecracker in the model there is a paused layer so you can insert it easily. 
> Print plate 1 is the model and print plate 2 is the casing for any modifying or editing. 
> Ask if you have any questions

Enjoy, stay safe!

(Special thanks to Bob, the dummy 13, for the help with testing several versions)