The V extruder project- a different approach
A new approach to "Recycler!" See Prober's comments http://forums.reprap.org/read.php?171,34188
Essence of an Idea: V parts related http://probersideas.blogspot.com/2010/04/essence-of-idea.html
New Field of Research: http://probersideas.blogspot.com/2010/06/new-field-of-research.html
I've run the tests several times, and between 66-68C, the heat shield makes a change in the RI.