This is a garden spinner in the shape of a stagecoach. The wheels spin in the wind. Assembly is simple: Place the pins (rounded side up) through the holes near the bottom of the body. Slip on four wheels, two per side with the spacers facing in. Carefully glue on the washers to the tips of the pins. For extra durability, you can insert a brass sleeve into the mounting hole on the bottom. Mount the spinner on a thin post with a brad nailed into it.
Use 100% infill on the body and 50% on the wheels. I scaled it to 600% in my slicer.