KINETIC GEARBOX

KINETIC GEARBOX is a desktop mechanical fidget toy designed as a fully enclosed transmission system that combines three different types of gear mechanisms within a single compact assembly. The objective was to create a smooth, precisely synchronized motion without requiring any post-processing or adjustment.

The mechanism incorporates:

• A 1:4 worm gear reduction

• 1:1 bevel gears

• Two 2:1 spur gear stages

All gear ratios were carefully calculated to form a closed kinematic system. Every stage is precisely matched to the next, ensuring smooth power transmission and continuous operation throughout the entire mechanism.

All parts are fully printable and engineered to fit together with minimal effort, allowing for straightforward assembly.

KINETIC GEARBOX demonstrates the combination of precision mechanical design, gear train kinematics, and additive manufacturing in the form of a compact desktop mechanism. Beyond serving as a satisfying fidget toy, it also functions as an educational demonstration of how worm gears, bevel gears, and spur gears can be integrated into a single, carefully engineered transmission system.

Assembly (fixed 6th August 2026):

1/ Lenght of axes - the shortest is in red gear, longer is next to in lightblue gear it and 2nd longest is in turquoise gear. Use pins from bottom to close axes.

2/ Add shorter bevel gear and small cyan gear with offset surface.

3/ Add structure and use the longest axis in worm gear.

4/ Add orange gear and last bevel gear by moving the axis in worm gear.

5/ Use pins to close the axes.

Enjoy your desktop fun fidget!

Im sorry, I made a mistake to firstly switched spur gears ratio. Now is online only version with right gears and body. (Print new body, cyan and turquoise gear. Everything else is same.)

Log 12-august-2026 - add keychain size 50% size.

Log 17-august-2026 - updated keychain/pocket version. Added nonsharp gears.

Terrible joke is to print mirrored worm gear (rightsided) - in that case nothing will move :D