3D Printer head Makerbot MK8 bowden extruder 0.3mm hotend nozzle 1.75mm filament
Amazon.com: Micro Swiss MK8 Upgrade Hotend for MakerBot Replicator 1 and MakerBot Replicator 2 w/.6mm Nozzle : Industrial & Scientific
Olearn 3D Printer Part Mk8 Dual Extruder Kits Double J-Head for Makerbot 3D Printer with 1.75mm Metal Supplies - China Mk8 Extruder Upgraded, Dual Gear Extruder Left Hand | Made-in-China.com