This episode of the 3D printer build is about the extruder. I started with an all metal bowden type of extruder and ended up with a ligtht Titan extruder from E3D (http://e3d-online.com/Titan-Extruder) using a short Nema17 motor (http://www.ebay.com/itm/231657785379?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT) and Igus bearings(http://www.ebay.com/itm/201718521654?_trksid=p2060353.m2749.l2649&var=501546063479&ssPageName=STRK%3AMEBIDX%3AIT). The redesigned part for the Titan extruder can be found here: http://www.thingiverse.com/thing:1939195
