Nerf Impact Grenade

This is a basic, impact detonated nerf grenade designed to launch rival balls in all directions. For safety, and preventing the 3D printed grenade from shattering when impacting hard surfaces, it should be covered with foam on all striking surfaces. (You will need a decent amount of foam, as hitting concrete will still cause failure with only one layer)

It has a total capacity of 12 rival balls (three per chamber)

I have not tested this with any other materials than PLA, but I imagine that tougher materials will lead to better results. If Printed in PLA, it will require a lot of padding

This is certainly not the best nerf grenade-like device, but it is cheap, and that is the point

Required hardware:

4x springs, roughly the size you would find in a soap dispenser

Thin strips of duct tape to hold springs in place

Pieces of filament to use as the pins where the flaps pivot. Using a metal pin of the same diameter will probably last longer, though

3x M3 screws (only two are required to connect the tail)

8x 3/8 in ball bearings for proper weight distribution (you could use anything with sufficient mass for this, but it is designed with bearings in mind)

A piece of wire or something that can be bent to use as the safety pin

A lot of ¼ craft foam (or similar)

Instructions:

If using filament for the rotation pins, I recommend slightly melting the ends with a lighter after installation to prevent them from falling out.

The tail piece is designed so that you can create and glue on foam fins for aerodynamic stability.

When properly assembled, it should be aerodynamically stable enough to always land on its base.

Do not throw this directly at someone, for reasons that should hopefully be obvious. You are responsible for safety during use.