more description please
I agree with DavidMBAFan11 more description!
please add a video
its ok 3 stars
CB engines go walking forward until the ultrasonic sensor to see the paper, after that the engine will moverse thus raising the base of the robot and doing more weight on the front so it will bend better paper.
LEGO, the LEGO logo, the Minifigure, DUPLO, LEGENDS OF CHIMA, NINJAGO, BIONICLE, MINDSTORMS and MIXELS are trademarks and/or copyrights of the LEGO Group.