This is Needle(Nubari) sword from Naruto. The loop on the back threads on so the blades can be printed separately then inserted or replaced.
Supports are not required, for best results use a .4mm nozzle. The blades can be printed all at once concentrically or individually in vase mode. I suggest printing in vase mode but if printing concentrically, the test print can be found here. Find detailed instructions on how to print collapsing swords on my website.
Printed on the Muldex rep-rap IDEX printer
The author marked this model as their own original creation.