Vented Filament Extruder

This is a concept design to allow a single device for cooling of the
filament as it extrudes, heat the filament material within the hopper,
and exhaust the toxic fumes from the extruder to an outdoor location.

The extruder is to be placed in a vertical position to allow the filament
to extrude straight downward as it passes through the extruder nozzle
for cooling and then on to additional components described in the
Lyman Extruder.