How can I use a 3D pen to create a model airplane?

To create a model airplane using a 3D pen, you can start by sketching out the design of the airplane on paper. Then, use the 3D pen to slowly build up the layers of plastic to form the different parts of the airplane, such as the wings, fuselage, and tail. Make sure to let each layer cool and harden before adding the next layer to ensure stability. You can also use different colors of plastic to add details and decorations to your model airplane.