1) The integrated shaft design ensures better concentricity of the gears, reduces eccentric rotation of the gears due to assembly, and ensures that the gears transport filament more evenly. 2) Helical gear design, better meshing performance, smoother gear transmission, and more linear transmission force. The transmission overlap is large, the meshing time is long, and the contact area is large, which reduces the stress, thereby improving the load-bearing capacity of the gear and extending the service life of the gear. 3) Use high-strength mold steel as the material of the feeding gear, and use nano-coating for treatment. The overall hardness HRC value of the gear reaches 62-65; the hardness HV value reaches 1000-1200, which greatly ensures the gear Strength, wear resistance and resistance, improve the bearing capacity of the gear and extend the service life of the gear. Name: Nano coating extrusion head gear kit Applicable models: For Adventurer 5M Color: As Shown Material: Metal Package Contents: 1 x Printer 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.