1. This is an MK8 Extruder Aluminum feeder Kit for 1.75mm /3mm filament. (3mm is only available for short distance ).
2. This kit is also available for both left and right hand direction short-distance and long distance(with two push-in fittings) which gives you 6 options in total please choose according to your requirement.
3. Please note that stepper motor and cooling system is not included.