I always liked the aesthetics of Hidan's scythe , and I thought it would be a cool weapon for a lego figure. Plus, if you have one of those really big printers, you could size it up and use it in real life cosplay.
Print with a raft and supports. I used a .2 layer height and a 50% infill. Be especially careful when removing the supports as the blades are a bit delicate.
Thingiverse account: https://www.thingiverse.com/Sh0rt_Stak/about