3D printing is a way of creating real 3D models using a printer. As opposed to printing ink, the printers use an additive technique where are physical material, often a type of heated plastic that cools and solidifies instantly, is added in layers to build up an object. The general principle is that the models are designed on a computer first, and then the printer uses these designs to print out the physical model.
The fact is, 3D printing is still quite expensive. While you can easily find the cheapest ink cartridges for your home printer to print off documents, 3D printing has a way to go before it becomes affordable for the masses. However, as more people adopt the technology, the costs are likely to go down considerably.
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