I tried to make it as close in size that it appears to be in the anime. An important note would be that I'm still learning how to make parts screw together and had a difficult time getting them to work. To save time you could always drill out the screw hole and just glue it together. I did manage with my print to get it to work, but it took some cleaning and partially drilling out some of the screw hole. Maybe my printer just need a little calibration? Either way, I had fun making it. I will post the build video later.
I upload videos and builds weekly on my Youtube page and on Thingiverse. If you would like to learn how to build 3D printed items like this for yourself, subscribe to my Shinobi3Dp YouTube page! https://www.youtube.com/channel/UCrdiYua17IqEYn0i6PQ9DUg