I uploaded a V2 that uses cap gun caps you can find here: Working flashbang V2 - with cap gun caps - Free 3D Print Model - MakerWorld

This is a working flashbang that produces sounds over 80dB of sound that is almost fully 3d printed the only non printed part are 2 small rubber bands as shown in the picture. Pla works and is pretty sturdy but dont blame me if your pla cant resist the force. I recommend using pla tough+ or petg. The assambly is pretty easy the only thing you need to do is put the smaller round piece into the tube and put rubber bands around the hooks the pull the cirkel up and twist it then you can insert the pin, you can use the pictures as help for the assembly. Make sure the cirkel is twisted and doesnt slide down before pulling the pin.

WARNING:

This is just a toy and isnt design to harm any person or animal.

credits to @realfunction for the idea, check out his models to.