1. The integrated shaft design ensures better concentricity of gears, reduces eccentric rotation of gears due to assembly, and ensures that gears port filament more evenly. 2. Helical gear design, better meshing performance, smoother gear mission, and more linear mission force. The mission overlap is large, the meshing time is long, and contact area is large, which reduces stress, thereby improving load-bearing capacity of gear and extending service life of gear. 3. Use high-strength mold steel as material of feeding gear, and use nano-coating for treatment. The overall hardness HRC value of gear reaches 62-65; the hardness HV value reaches 1000-1200, which greatly ensures gear Strength, wear resistance and resistance, improve bearing capacity of gear and extend service life of gear. Name: Nano coating extrusion gear kit Applicable models: for Adventurer 5M Processing technology: CNC Colour:White&Silver&Black Material:Steel + nano coating Package Contents: 1 x Extrusion Gear for AD5M 3D Printer Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.