Zero friction baloon toy
thingiverse
This is a toy uses air gap created by a baloon thus make the friction almost zero. Then the toy goes freely without any affect on it. You need to open the stick valve while blowing up the baloon, then fit it back in its place and a little amount of air leakage enough to make it work. Have fun... :) https://www.youtube.com/watch?v=zl0wRfhaIxQ
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