Pros and Cons of a 3-D printer.
When many people hear about a 3-D printer, the first thing that comes in their mind is how it can be used to make weapons. Even though that's mainly what's talked about, there is also a good side to 3-D printers.
You can make things like acoustic guitars, camera lenses, flutes, kaleidoscopes, plastic mugs, and even fabric! 3-D printers work by layering melted plastic to make a 3-D form. 
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