The Lix 3D pen is an experimental 3D printer that lets people doodle in the air. The tip of the pen melts plastic filament, which forms a wire as it exits the pen and cools down. Lix has raised £300,000 (USD $500,000) in a day on Kickstarter. The pen ?melts and cools colored plastic, letting you create rigid and freestanding structures and has a hot-end nozzle that is power supplied from USB 3.0 port.? Below is a widget of the Kickstarter campaign.