Metal Bowden Extruder Upgrade 1.75mm for RepRap 3D printer Prusa i3 or Kossel.
This kit can help you improve your print quality by getting rid of filament slippage. Aluminum doesn't soften at printing temp like the plastic printed parts can, leading to less idler spring tension, filament slipping, bad prints.
Hardware is included in the kit, but you might also need additional screws to mount heatsink with fan, for an example.
See supplied datasheet for 57 oz-in NEMA 17 stepper motor included in the kit
1 x Aluminum main extruder kit
1 x NEMA 17 Stepper Motor 57 oz-in, 40mm long body, with cable