Marvin was a heavyweight robot from Team 42, which competed in World Championship IV of the BattleBots reboot.It was a two-wheel drive, keyhole-shaped robot armed with a large 60lb horizontal flywheel made from a single block of white UMHW plastic. Its main chassis was milled from a solid piece of aluminum. Its weapon was not only unique for being made primarily from plastic, but the pair of hardened 4140 steel teeth mounted at either side were actually hinged, allowing the green teeth to extend outwards due to centrifugal forces acting on the robot. Not only that, but Marvin used four motors powering bevel-shaped wheels running against the inside of the primary weapon to spin it counter-clockwise. This friction drive allowed Marvin to get up to speed relatively quickly while allowing for the shock from the robot's impacts to not travel directly back into the weapon motors. Marvin uses many of the same internal components as Hal Rucker's DUCK!, making maintenance of the two robots significantly easier. (Battlbots Fandom Wiki Also yes it has the same problem with the teeth)