The drive system [Sugapes] is using is called a holonomic drive system. In his build, three omnidirectional wheels are attached to continuous rotation servos, each of them mounted 120 degrees apart.

The real interesting bit is the 3D printed omnidirectional Mecanum wheels he’s designed to fit the motors, which he thinks could have far reaching applications beyond his own project.

James Bruton is a serial crazy-contraption inventor, from a Lego longboard to a self-balancing mecanum-wheeled ... Four of the belt-driven omnidirectional wheels built into modules to be installed ...

Mecanum wheels are a special form of omnidirectional wheel invented by Bengt Erland Ilon. Unlike most wheels, which sport either smooth(ish) surfaces or textured tires, the rim of the mecanum ...

Hinchliffe also wants to experiment with mecanum wheels, which can be used for omnidirectional travel. To take a closer look at this Raspberry Pi project in action, check out the details at Tindie.