A Tracked Platform with suspension.
You will need to print:
2x Drive Sprockets
2x Track Sides (One mirrored!)
2x Idler Wheels
6x Road Wheels
12x Axle Caps
6x Suspension (3 mirrored!)
Some Track Links

You will also need:
2x Hobby Gear Motors (and something to power them)
1x Some sort of Hull
6x Pull Springs
Some M2.5 and M2 screws and nuts