WW1 & WW2 Mill's Grenade | First Modern Grenade*

Summary

Want a realistic Mill's Grenade with a handle that flies off when you pull the pin?  The Mill's Grenade (aka Mill's Bomb) was the first modern hand grenade (with a pin and flying handle) and was used in WW1.  This model is a later evolution, Model No. 36, that was used in WW2.  There's even a print-in-place version with a spring that prints right inside the grenade -- so you can remove it from the printer and use it right away!

(*) This is the No. 36 version, which was used in WW2, it was an earlier version that was used in WW1 and was the first modern grenade.

Background:  The "Mills bomb" was the popular name for a series of British hand grenades, designed by William Mills, that became the standard fragmentation grenade for the British Army and saw widespread use in the First and Second World Wars. Known for its distinctive cast-iron, grooved "pineapple" body, the bomb remained in British service until 1972 and in some other countries, such as India, until as recently as August 2021.

Spring options

1. Metal Spring (recommended) – if you have a metal spring, even a pen spring will often work, then print the metal spring profile.  It is designed to work with the Bambu Store's 0.5x7x12mm spring (linked lower on the page).  If you use a pen spring, you can usually cut it in half and get two springs.
2. Plastic Spring (print-in-place) – if you don't have a metal spring, but still want the handle to fly off, then print the plastic spring profile.  (see details below for more info about plastic spring).
   1. Don't leave the spring under tension when not using it as it will wear out much faster.
   2. If you want a spring that lasts longer, consider using the metal spring version, keep in mind even pen springs usually work.
3. No Flying Handle - if you don't want the handle to fly off and just want a grenade model, simply print the metal spring profile and don't put a spring in it.

Bambu Filaments used

• Silk+ Silver
• Matte Dark Red
• Polymaker Army Green (Amazon link)
• Metal Iridium Gold (although you can just use Silk+ Silver instead)

Plastic Spring Assembly

No assembly, it is full print-in-place.  The spring is printed right inside the printed grenade, simply remove it from the printer and its ready to use.

Metal Spring Assembly

• First insert the T shaped peg/plunger into the rectangular insert.
• Then place in a spring behind that.
• Lastly insert the insert with the peg/plunger and the spring into the top of the grenade.
• Keep in mind that its easier upside down.
• If your spring is rather long, then I would recommend using the rectangular peg insert with the hole on the bottom, its on the last plate.

( ! ) Do not sell my prints — I have not authorized selling prints.  If you sell my prints on Etsy, Amazon, eBay, etc, I will find out.

This 3D print is intended for decorative purposes only and is not suitable for children. Small parts may present a choking hazard and edges may be sharp. By printing this 3D print, you assume all liability for any harm to yourself or others resulting from its use.