Valken/Hakkotsu Thunder B Compatible Shell

Valken/Hakkotsu Thunder B Compatible Grenade Shell.

As with anything dangerous, mess with this at your own risk. I wanted to manufacture my own shells rather than buy them - as I'm printing them for a cost of around $1.40/ea versus $1.83/ea ordered in bulk from Evike. Not a huge savings, but you can have a shell in 3hrs instead of 4-5 days.

Print "Shell Neck Test" to make sure your printer is up to the task. It should be a solid thread fit and just fit past the center metal core. Adjust sizing on the test part if it doesn't fit, then use that multiplier on the real deal.

Real Thunder B threads are 13tpi, 28.6mm nominal diameter. The printed object in CAD is ~29.03mm nominal, printing at 28.89mm, or thereabouts. The cut threads in the grenade head are pretty deep, so there's a fair bit of wiggle room.

Printing should be done at 0.1mm layer height on a 0.4mm nozzle, 4 wall line count (4 inner, 4 outer), 12 top layers, 12 bottom layers. This should make the walls solid, as wel