Built for my daughter's 4th grade science fair — a 3D printed trap powered car and our first ever Tinkercad design! We tested 3 wheel sizes and 2 tire materials across 18 runs. The winner: Large 200mm wheels + TPU tires averaged 49.1 meters (161 feet) on one spring release — half a football field! Full kit with 3MF files and all experiment results on Makerworld. Would love to see your builds!