iPerfect(TM) 10Pcs 3D Printer 0.4mm Extruder Nozzle Print Head for MK8 Makerbot RepRap 1.75mm ABS PLA Printer Mk8 nozzle represent improvement over previously used Mk7 nozzle. Mk8 has shorter length of extrusion channel than Mk7, which helps to extrude plastic with less force. MakerBot Mk8 0.4mm Replacement Nozzle for Replicator 1 & 2 Stepstruder. This nozzle makes printing with PLA easier This product is dedicated on consumables only 1.75mm machine.