If you love modeling and designing, then you shall get a decent 3D pen. These pens will help you create 3D art and models, but how? Well, these pens contain extrude liquid plastic that instantly cools down and solidifies when you expose it in mid-air. When these 3D pencils came in the market for the first time, they were not so great but these days they have improved a lot and have become so advanced. You can use these 3D pens for a variety of other purposes as well, such as teaching children ...