1_75mm 3D Printer Extruder Gear Kit Compatible with Titan Bowden J-Head for NEMA 17 Stepper Motor

Item Descriptions:-[1.75mm Filament Diameter]: The hole of adapter is for 1.75mm only, not 3mm filament.-[3:1 Gearing Ratio]: Allows the use of smaller motors, making for a lighter weight carriage whilst maintaining reliability and pushing power.-[Extruder Assembly Kit]: As picture show, need to assemble it by yourself.-[Widely Used]: Compatible with NEMA 17 stepper motor (not included).-[Note]: It doesn't fit on CR10 Ender 3 series 3d printers.Package:1x Extruder Assembly SetItem Specifications:Type:Extruder AssemblyMaterial:PlasticFilament Diameter:1.75mmColour:Black