Note: Compatible with large‑particle building blocks; the model includes a base plate designed specifically for these larger bricks. If you don’t have such bricks at home, you can easily print them yourself. The design features nine different sizes of spur gears and three distinct gear assemblies, enabling the creation of both acceleration and deceleration mechanisms.

To minimize friction while eliminating the need for metal hardware, I incorporated bearing structures into each component. After printing, simply push each roller inward (as shown in the diagram), then gently flex the inner race of the bearing to ensure smooth, effortless rotation.

Due to the spacing constraints imposed by the building blocks, I developed three types of connecting bases that allow gears of varying angles and sizes to mesh seamlessly. When assembling, simply use pins to connect the bases to the gears, then mount the entire assembly onto the building block base plate for playtime.