Wind turbine
thingiverse
Wind Turbine for Balcony or Garden - No Electricity Required! A fantastic way to verify if there is wind outside without stepping out. I employed two bearings from a spinner with an outer diameter of 22mm and an inner diameter of 8mm. You will also require eight M4X20 mm bolts (Allen wrench recommended). Building this project is relatively straightforward, requiring only a few screws - have fun!
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