FLL-Bot Mark II by Ray McNamara
Ray McNamara refined his FIRST Lego League (FLL) EV3 robot into this "Mark II" design. Shown standing on its end, the rear-wheel-drive 'bot can be built with the parts available in the EV3 Retail 31313 set. The front-mounted "Forklift" attachment clips onto the "Dog Gear" power takeoff, and is good for pulling loops in the FLL Robot Game. The front caster wheels provide stability. The underside shows a center-mounted EV3 Color Sensor for Line Following. Its placement alleviates issues related to Ambient Light Level changes, since the sensor is shielded from the sun and from people shading the robot while standing around the FLL gaming table. There are connectors on the sides to mount additional sensors if desired. Since the EV3 Infrared Sensor (shown here in green) cannot be used in the FLL Robot Game, substitute a 45504 EV3 Ultrasonic Sensor instead (shown mounted on the underside). An extra (pink-colored) 5x7 Technic Liftarm (Part 64179) is not included in the 31313 set, but you can get one easily from Bricklink or other sources. [Note that the LDD file does not contain the EV3 Ultrasonic Sensor or that extra 5x7 Liftarm frame; it contains only the EV3 Set 31313 parts.]
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