Update 2015-12-07: I've finally printed this thing and found the design didn't mate as expected. So I've updated the parts using screws instead of little fragile nails, and added some more play between the gears. Now the winch works as expected!Warning, this is my first design, and i still haven't print it, so I usually don't know if it works. I've put it here to share the design and to look for opinions and enhancements. EDIT: WRONG: The ratio should be more or less 1.43:1 , calculated if I'm not wrong: ratio = 60 / (24+18) , which are the teeth numbers.. CORRECT: The ratio is: (sun_teeth_n+planet_teeth) / (ext_teeth / 2) in this case: (24 + 18) / (60 / 2) = 36 / 30 = 1.2. this means that after 1 handle turn, the winch turns 1.2 ruonds. The 'sun' gear is fixed on the base axis, the handle turn the 3 planets, which multiply the external gear rotation, which is attached to the winch. It doesn't use any bearing, so maybe the friction will be too much, but with some grease... I would be glad if someone would like to print it and tell me if it fits and work.I've added all the single stl files ready to print. Use all files starting with Pl_ while the file named Planetary3.stl is the old design, which doesn't couple very well..