A 3D pen is an innovative handheld device that allows users to draw three-dimensional objects in real time. It functions similarly to a hot glue gun, using plastic filaments instead of ink. Once the filament is heated and melted inside the pen, it is extruded through the tip, allowing the user to “draw” shapes and models in the air or on a surface. As the plastic cools, it hardens and retains its shape, enabling the creation of 3D structures by hand.
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