*[http://www.thingiverse.com/thing:30642 LYMAN FILAMENT EXTRUDER]
*[http://youtu.be/UG8jZpW81IE doctorcontra's Extruder for 3D-Printer Filament]
*[http://www.youtube.com/watch?NR=1&v=WaB-dsB1Kfk&feature=endscreen Extruder Operation & Control: Single Screw]