Print-in-Place Stackable Planetary Gear Set

1. A compact planetary gear system with herringbone teeth – designed to be printed in place, no assembly required.

2. Captive Gear Design: The herringbone teeth keep all components securely interlocked, allowing smooth operation without separation.

3. Custom Gear Ratios: The core version offers a 1:5.25 ratio, with links to other versions (1:4 and 1:3) available for customization.

4. High Performance: Designed to operate smoothly after breaking in with an electric screwdriver.

5. Scalable Print Design: Suggested to scale 1.5x or more for smoother post-print motion.

6. Strong Build: Recommended 40%–100% infill for enhanced durability and better mechanical engagement.

7. Advanced Engineering: Designed using SolidWorks and gear-generation tools, with precise herringbone alignment for true meshing.

8. User Tips: Add a drop of oil after printing and spin vigorously to free up the gear teeth. Handle design improved in later versions.

🖨️ Print Specifications:

• Printer Brand: Creality / Ultimaker

• Printers Tested On: Ender-3 V3 SE, Ultimaker 2+

• Layer Height: 0.08 mm to 0.2 mm (lower is better)

• Infill: 40% or more; 100% for best strength

• Nozzle: 0.25 mm (recommended)

• Cooling: Off for small parts

• Supports/Rafts: Not necessary

🔧 Assembly & Post-Processing Tips:

• Break in using an electric screwdriver

• Apply sewing machine oil for smoother gear movement

• Twist the gear teeth manually after print if stuck

• Gear spacers tapped for 1/4 - 20 threads

• Handle tapped for 3/8 - 16 threads

• Improved ring design for better grip and easier access