Topic: Upgrade request. Perfect "String Theory".
Filament puller.
Stepper motor at the end of the nozzle (far enough to get a grip on cooled down filament).
Speed adjustment knob with display value or some sort.
Its to Speed up/Slow down of filament exiting the nozzle to fine tune diameter due to swelling.
The need for filastruder to stay up certain distance from the floor will be eliminated.
Curling up of the filament will go away. It will keep it more if not perfectly straight because pulling force is constant VS gravity and some accidental resistance caused by curling up on the floor.
It is a theory but i've seen it in action. I dont know if the motor was a stepper motor or not, but it did have speed adjustment to control how fast it pulls on the filament. Its purpose was to fine tune the diameter.
https://www.youtube.com/watch?v=cRJEcWHZEmM
my 3d models http://www.turbosquid.com/Search/Artists/tonycstech