Geeetech Assembled all-Metal long-distance J-head hot end with heating wire for bowden extruder RepRap MakerBot Kossel (For 1.75mm filament with 0.4mm Nozzle) Easily and well interface with the most popular RepRap extruders. The filament path is same with the one of an already proven design, it can be used to print reliably with both ABS and PLA. It's very simple by reducing the number of custom machined parts to a bare minimum.