3D printing

     3D printing is surely an innovative invention that makes three dimensional solid objects from a digital file. 

     This technology has paved a new pathways for many people and sciences. For example, it can now print out jewelries, acoustic guitars, and other instruments, medical models, lights, cups, and heels, and many more. It not only produces objects with a reasonable costs, but also very precisely. 

     Bones and organs can also be printed out for medical purposes, and patients do not have to wait to find their appropriate donors. 

     However, because it is so easy to print out and is cheap, some people tend to use this technology to hurt people.  Cody Wilson, a law student who gained fame for creating the first fully 3D printed gun, was able to design and print his gun "The Liberator" less than a year. Then he uploaded the file so that everyone on the internet can view and download. Now, anyone, if they wanted to, can print out a gun, and use it for their own will. 

     3D printing is a very useful and helpful technology, but is in need of some restrictions.