Balloon car with triangle wheels
myminifactory
This 3D printable car model features an air balloon propelled design, attaching directly to the flanged pipe on its chassis. What sets it apart from similar models is the non-circular rear wheels, which surprisingly provide a smooth ride despite their unique shape - you can learn more about the Reuleaux triangle's role in shaping them by visiting Wikipedia (https://en.wikipedia.org/wiki/Reuleaux_triangle). The front wheel supports allow for random direction changes. Note that some axes may require sandpaper to ensure smooth rotation, and applying graphite grease with a pencil lead can also help.
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