Planetary Gear set. This is and educational model to show how a planetary gear set works. You will need to print 2 of the planetaryGears2Triangle_000.st and 3 of the planetaryGears2Gear_003.stl. I used 6mm x 30mm bolts. Lock nuts should be used on the bolts.
This will need to be filed in several places to make the gears mesh properly
I used Blender to design this model. By animating in blender i was able to see how it would respond