Ultralight coaxial helicopter with rubber engine
cults3d
It is a very fun toy, easy to print and assemble. You need 1 or 2 sticks of 2.5mm skewer, which is available in any supermarket or store, works with any rubber band but depending on the quality of this helicopter will fly more or less, the ideal would be to use "rubber tan" for model airplanes, which is the one used by the small planes powered by this type of rubber engines.
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