The Bucket Wheel Excavator will soon hold the honor of being the largest LEGO Technic set in history. This isn't just an enthusiast build - it's a real-deal for-purchase set from LEGO. Users will be putting together 3,900+ pieces to create one of two sets. This set allows you to choose between two sets of directions, building either the Bucket Wheel Excavator or the Mobile Aggregate Processing Plant. This model also has a motor and battery box to make its final build as engaging and authentic as possible.