3D printing is when 3D solid objects are made from a model on a computer. 3D printing is done by building up the object layer by layer. Usually, 3D printers use plastic, because it is easier to use and cheaper. Some 3D printers can 3D print with other materials, like metals and ceramics.
3D printers are useful because they can make new objects very fast. This means an engineer can test a lot of new designs and not have to wait for someone else to make them. They are also useful for fixing parts made of plastic, and for making toys, figures, and models.
3D printing is usually done with a materials printer. Since 2003, many more materials printers have been sold than before. Also, the cost of 3D printers has gone down.
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