M67 Training Grenade (Accurate Weight, Impact Resistant)

thingiverse

M84 Stun Grenade Trainer: https://www.thingiverse.com/thing:5665214 This is a M67 fragmentation grenade made for my ROTC unit for tactical training. It has seven voids inside and is designed to accept a 1.75" section of 5/8" threaded rod through the center of it and six 1" pieces of the same rod around it to to make it the exact same weight as a real M67. Use it for your own tactical training, airsofting, and more! Some assembly tips found via trial and error: - Print the halves of the grenade with the flat face down and supports in the voids - Print the fuse of the grenade vertically but inverted (top flat face on print bed) - Print all parts separately, TPU strings readily - Cutting the threaded rod will result in burrs that complicate inserting it, bevel the edges for easier insertion - Heating the rods in the oven to about 300F or on a gas stove flame lets you heat-fit the rods for easier fitment and stronger adhesion (I can't imagine doing it without heat fitting) - Using a vice to force the two halves of the grenade together would be best, but a rubber mallet worked for me: the tolerances of the voids are designed to keep the halves together with a considerable amount of force and require a similar amount of force to put together - Consider printing the top half with more walls: some of my grenades broke at the fuse stem on the top half of the grenade body