1.CNC hollow all-metal shell, high-quality accessories, high precision, good strength, not easy to deform, high temperature resistance; Hollow shell bracket design, design, light weight, smaller inertia. 2.POM gears are upgraded to (30% glass fiber) gears. material has excellent properties such as high temperature resistance, heat insulation, and wear resistance, which can effectively block the heat generated by the motor and solve the problem of blockage. 3.High-quality hard steel nano-coated gears, wear-, good precision, and . 4.There is a tube metal joint at one end, which can be adapted to more models in close and long distance. 5.Spur gears with mold steel matching and nano-coating treatment process are configured, which has more stable transmission and longer service life. Scope of application: for , -10, CR10S, -10 4S, -10 5S, -10 MINI, -20, for -2, for -3, for -3 PRO, for -3 V2, for Gasherbrum K3. If you can design the mounting bracket, it is suitable for almost all FDM 3D printers. Note: The motor in the picture is not included Notes: The E- step value of the extruder needs to be modified, for example: the E- step value of for 3 is 870. The maximum extruder drive current is 1A, and it is recommended to use it at around 0.8A, which not cause excessive heat. Reason for adjusting the current: to obtain a more suitable torque and prevent the motor from overheating. Color: Grey Material: Aviation Aluminum + Package Contents: 1 x for V3 Extruder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.