how does the 3d printer pen work

Question: how does the 3d printer pen work
- Keywords:
  3d printer,
  pen
Asked by Duchess to Steve on 16 Mar 2015.
- Steve Cox answered on 16 Mar 2015:
  
  It’s very similar to a glue gun, except a stick of plastic goes in at one end (rather than an adhesive stick), and a steady stream of hot plastic comes out of the other end like toothpaste from a tube.
  
  It’s up to you to decide how to build up the plastic to make your finished object.
  
  Using the 3D pen is very similar to drawing freehand in order to make things, compared to designing on a computer and using a 3D printer to do it for you.

Question: how does the 3d printer pen work