This 3D printable blade is modeled after the one Jonin, Asuma Sarutobi, uses in Naruto. It features a combination brass knuckle and trench knife structure.
Known as a Chakra Blade, this blade is able to absorb the chakra of its user and become the origination for various attacks in the show.
This blade measures about 7 inches by 3.3 inches by .25 inches. It can be scaled up and down pretty reliably to fit your needs.
Print this up and use it to make your Naruto cosplay look even better!