Planetary Sun Mechanism
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This is a functional decorative mechanism based on a planetary gear system.
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Model information
- Source
- Printables
- Category
- Mechanical Parts
- License
- Creative Commons — Attribution
When rotated, the “sun petals” smoothly extend outward and retract back. The model was originally designed as a tactile control knob for a variable resistor (potentiometer) used in LED lighting systems.
⚙ How it works
Inside the model is a compact planetary gear system. Rotating the center disk drives the gears, which synchronously move the outer petals in and out.
🔧 Features
Planetary gear mechanism
Expanding/retracting “sun ray” petals
Designed for potentiometer control (LED dimming)
Fully 3D printable assembly
🖨 Print settings
Material: ABS, PETG, PLA
Nozzle: 0.4 mm
Layer height: 0.2 mm (or similar)
Infill: 15–25%
Supports: Not required (depending on your printer tuning)
🛠 Assembly
The model is designed as a multi-part assembly
Gears and petals should move freely after printing
Light sanding or lubrication may improve movement
The center hole is intended for mounting on a potentiometer shaft
The mechanism requires:
10 petals
2 linkage arms per petal
As pivot pins, use pieces of 1.75 mm filament
In the top cover, you may need to drill holes to fit the filament pins
If you want the petals to open in the opposite direction, simply mirror the internal gear before printing
💡 Use cases
LED brightness control knob
Interactive decoration
Educational demonstration of planetary gears
Desk toy / fidget mechanism