Planetary Fidget Spinner - Con quay bánh răng hành tinh

This 3D printed gear mechanism is a satisfying and eye-catching mechanical model designed to show how multiple gears move together. The circular outer ring holds three large rotating gears, a small central gear, and a three-arm handle that allows the mechanism to turn smoothly by hand.

Printed in a bold black and red color combination, the design has a strong industrial look with visible layered details that highlight the 3D printed style. The red inner accents create a nice contrast and make the gear movement stand out when the model is spinning.