SRD-1 Grenade: Laffs Dynamics

The SRD-1 (Shrapnel Release Device) is a quick to produce, shrapnel dispersing explosive device.

Printer Used: Ender 3 V2

Filament Used: PLA+

Print Settings:

Extruder: 220C 

Bed: 56C 

First Layer Print Height: .2mm 

Standard Layer Height: .12

Wall Thickness: .40 

Wall Perimeters: 9+

Infill: 80%+

Print the fuse guide and device body upside-down. 

Materials Needed:

Black Gunpowder

15x 5mm Steel Ball Bearings (Or 12x 6mm Steel Ball Bearings)

3mm Pyrotechnics Fuse (80mm-85mm in Length)

Plastic Bonding JB Weld or Epoxy 

Blue Painter Tape

Assembly Instructions:

1) Insert the fuse though the fuse guide, leaving 20mm-25mm of it exposed out the top end. Use blue tape around the tapered 

threaded end of the fuse guide to keep the rest of the fuse in place. Do not cover the entire exposed fuse with tape, only a 

small amount is needed to adhere. 

2) Pour black powder into the device body's inner chamber, filling roughly half of the volume. 

3) Pour in ball bearings. 

4) Apply epoxy to the bottom of the cap, and the threads of the fuse guide. 

5) With a pair of needle nose pliers inserted into the top channels of the fuse guide, screw said fuse guide into the device 

body. 

6) Allow epoxy to cure for at least 8 hours minimum. 

7) LIGHTLY shake the device to distribute ball bearings in the gunpowder. 

8) I don't think I need to tell you how to set off fireworks... but store in a dry, dark place until use. 

Notes:

1) The smaller variant of the explosive device can be found here: https://defcad.com/library/c3925700-d477-4a80-af32-b6ba833714cb/ 

2)The hosting website, nor I take responsibility for any injuries or deaths that may occur with the download and(or) use of this device and its code.