This is a modified version of Geo Hangen Extruder ( http://www.thingiverse.com/thing:15897) to include a spring tensioner for the wire.This is more reliable and allows the use of different diameters of fiament.Some parts need to be mirrored or rotated to be correctly printed. Use infill 25% for all the pieces apart from smaller pieces.The parts 50materialwheel and 50pin-M4 are made of steel.I use the standard bearings of the Ultimaker 8x16x5 mm, you will need 3x.22/Jan/2016Updated the bearing holder part to better fit the design.Added a modified version of the fitting block to allow groove mount Added a modified version of the body of the extruder to allow the bowdne to go deeper inside