A 3D pen is a pen that extrudes heated or warm plastic from the nozzle of the pen. With a 3D pen, you can draw raised graphics on a piece of paper or any flat surface. But the real uniqueness of the 3D pen is that it can "draw" in mid-air, allowing you to immediately form a 3D structure in front of you, which you can pick up and hold in your hand.
How the 3D pen works
Most 3D pens work by putting plastic into the pen and then melting it before it comes out of the nozzle at the end of the pen (this is what we call "extrusion"). Depending on the material you put in the pen, the pen will heat up to different temperatures.
So how can you draw in 3D? When it leaves the pen, the molten plastic is soft and malleable, but it solidifies within a few seconds to form a strong, stable, and pickable structure.
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