3D printing works through a process called additive manufacturing. Additive manufacturing is the process of making an object layer by layer. There are three main ways to do this. One way is to use a chemical that turns solid when a certain light hits it. This light will usually be a UV light. Another way to do this is to use a molten liquid that turns solid when ejected from the printer head. This liquid could be ink chocolate or even cheese. A final method is to use a powdered material that is either glued or heated to fuse the powders. 3D printing is an amazing invention that I believe could change the world.