3d pellet extruder

https://www.youtube.com/watch?v=Wx7GugDZOx4 and https://www.youtube.com/watch?v=l-qAQ6kQWO0  pellet extruder instead of filament.

titan robotics
https://www.youtube.com/watch?v=QB4HyC4gIDc

links
Heated chamber hack the Stratasys patent with a Fronting company