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NOTE: ▲This upgrading replacements ONLY for Ender 3 and CR-10 Series 3d printers. ▲Stepper motor is ONLY for reference,NOT included in package. Specifications: [Aluminum Extruder] Special bowden tube fitting:PC4-M6;Fits for ID:2mm OD:4mm Tube; MK8 Drive Gear:40 Teeth, inner diameter:5mm ,outer diameter:11mm,height:11mm ; Groove Bearing:624U ,groove diameter:11mm ,outer diameter:13mm ; [Bed Leveling Springs ] Hole Diameter (OD) : 8mm; Rod Diameter (Inner Dia) : 4.4mm; Length:20mm; [Bowden Tube] Color:Black Inner diameter:2mm±0.05mm; Outer diameter:4mm; Length:80cm; Package List: 1xAluminum Extruder 1xBowden Tube 4xStiff All-Metal Springs