The Kunai is simple to put together, consisting of three parts that seamlessly connect and are secured with glue.

The blade slides onto the top of the handle, while the ring attaches to the bottom. To assemble, just apply a little liquid super glue into the holes and push each piece into position. Make sure to align the ring properly before the glue dries.

For a more authentic look, I wrapped twine around the handle and fixed it in place with glue. The same twine is also used to create the string tied to the ring.

Keep in mind that the blade's tip is sharp but quite delicate, so it might break if handled roughly.

This model is printed with 5 wall loops for added durability. The blade and handle print easily without supports, but the ring might need them depending on your printer settings and the orientation you choose. 

I suggest printing it upright (as positioned in the model) to ensure the rod fits securely into the handle.