About this 3D model
The FIRST system open-source that use only one hot end for print 2 color! you can use this system with : - Jhead or similar - budaschnozzle or similar ( adapter : http://www.thingiverse.com/thing:130200) for more information and story of the development of this system : http://3dita.falaschi.com/search/label/FalaUnion-Mono