Walkabot is a 3D printed, gravity powered, ramp walking robot. In technical terms this automaton is considered a passive dynamic walker. When placed on a shallow ramp the robot will walk down the slope. The robot makes a “walka-walka” sound as it walks.
The files to 3D print your own Walkabot can be downloaded here: Walkabot on Thingiverse
More about passive dynamics:
Passive dynamic walking robots are simple mechanical devices that can walk down a slope powered only by gravity and inertia. They do not require actuators or control systems, yet produce a steady walking gait with human-like motions. Because they do not require a power source they are described as passive and their movement is characterized by a dynamic stability. This means that they are not stable at any one point while in motion but are balanced in time so that the gait is steady and smooth. All bipedal walkers, including humans, must maintain dynamic stability in order to walk without falling over. The passive dynamic walker achieves stability through a steady rocking cycle. Although the term and its principles were developed by Tad McGeer at Simon Fraser University in the late 1980s, the concept is much older and dates back to toys invented in the 1930′s – see patent US2140275. These entertaining toys rely only on gravity and the natural swinging of their limbs to walk forward down a slope.
Karl P. Williams