3D pen is a pen that extrudes heated or warm plastic from the pen's nozzle. You don't need any software. But what makes a 3D Pen for Kids truly unique is its ability to“draw” in mid-air, allowing you to instantly form 3D structures right in front of you, which you can pick up and hold in your hand. A 3D pen is a pen that prints in 3 dimensions. If that's a bit confusing to you, then don't worry because 3D pens are relatively new.Designed in a pen-like structure, the 3D pen very much resembles a normal pen, but much bulkier.