For my Marine Biology Class, we are studying alternative energy and working on a project to create energy from wind power. Working on creating a gear system to generate more energy with the small fan and motors I have. This work is not finished, but part of a larger project.
Gears were made with: http://geargenerator.com/
the SVG file was modified in inkscape (https://inkscape.org/en/) on a Macbook
and the rest of the design was done in Tinkercad
with much of my school related designs I like to use freeware and online applications to provide as much access as possible for my students.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/0BcJhNU0VT1
Printed without rafts or support.
You need some 5/16 threaded rods, along with washers and bolts to put things together. A little milling of the holes may be necessary. The motor I used was a small one I had lying around.