Forward or Reverse Direction Metal Extruder Kit With NEMA 17 Stepper Motor For RepRap Prusa i3

**TWO option for your reference: #1 is Reverse Direction Bracket + Motor. #2 is Forward Direction Bracket + Motor. Please note that before you buy it .... Description: - 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. - Short distance - Stepper Motor: 42HD4027-01 - See supplied datasheet for optional 57 oz-in NEMA 17 stepper motor. Note: * Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. * Please allow 1-3CM differs due to manual measurement. * Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Package included: 1 x Aluminum main extruder body 1 x Aluminum tension lever 1 x Idler bearing for 1.75mm filament 1 x Brass drive gear 1 x High tension spring 1 x Assembly screws 1 x Stepper Motor, 40mm long body, with cable