MindCuber-RI is a robot that can solve the well-known Rubik’s Cube® puzzle. It is designed by David Gilday and Mike Dobson.

It is built using elements from a single LEGO® MINDSTORMS® Robot Inventor set 51515.

MindCuber-RI is significantly faster than previous MindCuber and PrimeCuber designs because it makes use of the fourth motor available in the Robot Inventor set to implement a faster tilting mechanism. Older MINDSTORMS and SPIKE Prime sets only included three motors.

Building instructions and software are now available on http://mindcuber.com/mindcuberri/mindcuberri.html alongside those for MindCuber for LEGO MINDSTORMS NXT, MindCub3r for LEGO MINDSTORMS EV3 and PrimeCuber for LEGO Education SPIKE® Prime.