The crawler, known as the sea cucumber, uses a LEGO frame and tracks as well as official LEGO motors. The build uses very few non-LEGO pieces, most of which are only used to control or give an entertaining face to the model.
The creator, who goes by the Twitter handle of nisshan_ uses a unique element attached to every other track element. The piece was 3D printed and holds a set of LEGO wheels at an angle, similar in design to Mecanum wheels, which allow a vehicle to move in any direction.
As a result of this unique element, this crawler can move sideways on its tracks. The sea cucumber is controlled with ROS, otherwise known as the Robot Operating System, running on a Raspberry Pi. However, it’s not hard to imagine it being controlled with official LEGO systems too.
As impressive as this build is, nisshan_ has since upgraded the model which has been shown off in a new video on Twitter. The trilobite is a new, more compact version of the sea cucumber that uses a single set of two tracks with the 3D printed element on each side.