Vertical axis wind turbine spinner
thingiverse
Intended for 200x200mm printbeds Wether one takes a <a href="https://www.tesla.com/blog/induction-versus-dc-brushless-motors">brushless motor or induction motor</a>, and a <a href="https://www.allaboutcircuits.com/textbook/semiconductors/chpt-3/rectifier-circuits/">rectifier</a>, or a <a href="https://en.wikipedia.org/wiki/Electric_motor#Brushed_DC_motor">brushed DC motor</a> as a generator This print, a motor + mount, M5 threaded rod and a motor-rod coupling, should get you started with generating electricity. If one wants to store this energy into batteries, one can take a look at "solar charge controllers"
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