The ninja star featured in this project is an illusion designed to be used in a costume or theatrical effects. The ninja star can be adhered to the skin by buying a special type of glue at a Halloween store. A bottle of fake blood can also be bought to help with the look. If you would like the whole version of the ninja star, I have also made that stl availabe here http://www.thingiverse.com/thing:1833994
If you have a cheaper printer make sure you position the file where your printer is able to print the points.
When I was younger I would always try to make my own costumes using stuff I had to buy from the store. Things added up and got expensive. I decided to make this as a cheap alternative. I looked up pictures of ninja stars and made one. I then cut off part of two points to create the illusion.