Gravity powered fan

Gravity powered fan.The fan is 256 mm in diameter and powered by gravity.The main gear is turned by the attached weight and through the 3 sets of gears converts high torque to high rpm. The assembly requires 2 x 20mm aluminium tubes/pipes (178mm and 123mm in length), 5 ball bearings (20mm ID, 42mm OD and 12mm thick) and a 2mmx30mm pin all available at any hardware store!Along side the STL file i attached the STEP file aswell.I do apologise for not being able to provide more than a 3d model.