Ninja Disc - penny size Ballista Launcher Ammo
thingiverse
This is a penny sized disc to use instead of a penny for catapults, ballista, and launchers. It comes from an ancient design used by the Ninja. Actually I just drew some curves and used the Fusion 360 circular pattern sketch tool. It is 1.5mm thick and 18.9 mm wide, from the measurements of a penny.
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