With the same principle as a 3D printer which can make a three-dimensional object by overlapping the melted resin on the laminate, you can "extrude" the resin melted from the pen tip "hand-drawn" in the air to make a three-3D print pen"The world
LIX - The Smallest 3D Printing Pen in the World by LIX — Kickstarter
World's Smallest 3D Printing Pen
LIX: The World's Smallest 3D Printing Pen Lets You Draw in the Air
World's Smallest 3D Printing Pen
LIX: the world's smallest 3D printing pen doodles in mid-air
Smallest 3D Pen Lets You Draw The World Around You
THE SMALLEST 3D PRINTING PEN IN THE WORLD: LIX
LIX - The Smallest 3D Printing Pen in the World by LIX — Kickstarter
Lix 3D-printing pen allows users to create solid drawings in mid air
This is the World's Smallest 3D-Printing Pen » TwistedSifter