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Anycubic All Metal Right Hand MK8 Extruder
https://amzn.com/B0196B285I
3D Printer MK8 1.75mm Filament Aluminum Alloy Extruder Kit W/ Bracket
http://www.ebay.com/itm/3D-Printer-MK8-1-75mm-Filament-Aluminum-Alloy-Extruder-Kit-W-Bracket-Hot-/361682351894
http://www.ebay.com/itm/3D-Printer-MK8-1-75mm-Filament-Aluminum-Alloy-Extruder-Kit-W-Bracket-66-/282115508787