1. http://reprap.org/wiki/File:Extruder_lemio.svg http://reprap.org/wiki/File:Extruder_lemio.svg
2. http://en.wikipedia.org/wiki/Plastics_extrusion http://en.wikipedia.org/wiki/Plastics_extrusion
3. https://www.makerbot.com/support/new/04_Desktop/Knowledge_Base/Using_Custom_Slicing_Profiles/10-MakerBot_Slicer_settings:_Backlash_Compensation https://www.makerbot.com/support/new/04_Desktop/Knowledge_Base/Using_Custom_Slicing_Profiles/10-MakerBot_Slicer_settings:_Backlash_Compensation
4. https://www.makerbot.com/support/new/04_Desktop/Knowledge_Base/Using_Custom_Slicing_Profiles/17-MakerBot_Slicer_settings:_Fan_controls https://www.makerbot.com/support/new/04_Desktop/Knowledge_Base/Using_Custom_Slicing_Profiles/17-MakerBot_Slicer_settings:_Fan_controls
5. https://www.makerbot.com/support/new/04_Desktop/Knowledge_Base/Using_Custom_Slicing_Profiles/17-MakerBot_Slicer_settings:_Fan_controls https://www.makerbot.com/support/new/04_Desktop/Knowledge_Base/Using_Custom_Slicing_Profiles/17-MakerBot_Slicer_settings:_Fan_controls