The concept is more or less the other way round. The filament pulls the syringe and squeeze the material out.for more images and movies, see http://www.facebook.com/europerminutedesignResize the shapes suited for your syringe.Print the syringe holder.Print the end stop enlargers.Screw same [ultimaker spare] m3 bolts through the holes to fixate the syringe holders to the moving head.Attache everything.Generate gcodeWithout temperature settingsVery low extrusion speedOpen the gcode in a text editor and replace "E" with "E-"[we want to pull the filament not push it, you can also change the firmware, but this was easier for me]Print and use the live control panel in repg to tune the flow and speed.