Mellow RNC Nano Coating Dual Drive Gear Kit – DDG 3D Printer
Mellow RNC Nano Coating Dual Drive Gear Kit – DDG 3D Printer
Mellow RNC Nitrogen-Based Nano Coating Dual Drive Gear Kit for 3D Printers
Upgrade your direct drive extruder with the Mellow RNC Nano Coating Dual Drive Gear (DDG) Basic Kit — engineered for precision, durability, and high-temperature compatibility. Whether you're running a DDG, DDG Wind, or NF Sunrise extruder, this kit delivers exceptional filament grip and ultra-low wear performance for consistent, reliable 3D printing results.
Key Features
- RNC Nitrogen-Based Chain Nano Coating: Ultra-hard surface treatment rated at HV3300 hardness for extreme wear resistance and long service life.
- Precision CNC Machined: Inner hole dimensional accuracy of ±0.02mm ensures a tight, high-concentricity fit on the drive shaft.
- Minimal Arc Tooth Runout: 0.03mm runout tolerance guarantees uniform, slip-free filament grip with up to 15kg of drive force.
- Hardened Steel Matrix: Overall hardness reaches HRC60+, delivering superior resistance to wear compared to standard drive gears.
- All-Metal Construction: Rated for printing temperatures up to 500°C — compatible with high-temp engineering filaments.
- Direct Drop-In Replacement: Designed to replace OEM DDG, DDG Wind, and NF Sunrise dual-drive extruder gears with no modifications required.
- 1.75mm Filament Compatible: Precision-matched groove geometry for reliable feeding of 1.75mm filament.
Specifications
| Brand | Mellow |
| Model | 7RNCPHDGK |
| Material | Hardened Steel with RNC Nitrogen-Based Chain Nano Coating |
| Surface Hardness | HV3300 |
| Matrix Hardness | HRC60+ |
| Drive Force | 15 kg |
| Max Print Temperature | 500°C |
| Inner Hole Accuracy | ±0.02mm |
| Arc Tooth Runout | 0.03mm |
| Filament Diameter | 1.75mm |
| Assembly Required | Yes |
| Country of Origin | Made in Mainland China |
Compatible Extruders
- DDG Extruder
- DDG Wind Extruder
- NF Sunrise Extruder
- Aquila Wind Extruder
What's in the Box
- 1× RNC Nano Coating Direct Drive Basic Kit (as pictured)
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Frequently Asked Questions
Q: What extruders is the Mellow RNC Nano Coating DDG Dual Drive Gear Kit compatible with?
A: This kit is designed to work as a direct replacement for DDG, DDG Wind, NF Sunrise, and Aquila Wind extruders. It fits any extruder design that is based on or compatible with the DDG dual drive gear layout.
Q: What makes the RNC Nitrogen-Based Nano Coating better than standard drive gears?
A: The RNC (Nitrogen-Based Chain) nano coating achieves an ultra-high surface hardness of HV3300, far exceeding conventional drive gears. Combined with a hardened steel matrix rated at HRC60+, these gears resist wear significantly longer, maintain precise filament grip, and can handle high-temperature printing environments up to 500°C.
Q: Does this kit require any tools or modifications to install?
A: Yes, assembly is required. The kit is engineered as a precision drop-in replacement, so no major modifications are needed for compatible extruder models. Standard 3D printer hand tools are sufficient for installation.
Q: Is this kit compatible with 2.85mm filament?
A: No, the Mellow RNC DDG Dual Drive Gear Kit is specifically designed and precision-machined for 1.75mm filament. It is not intended for use with 2.85mm or 3mm filament diameter setups.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.