Lego compatible compressed air engine
thingiverse
I wanted to make a smaller engine, someone said it would be nice if we could power lego with it. so, it had to - be small - fit lego - not be to powerful - run on not too much pressure - be self starting so it's just that, a small simple self-starting lego compatible engine :) short clip.. https://www.youtube.com/watch?v=YkbbkBF4Dc8
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