About this 3D model

I am trying to develop a practical, hand-cranked pump for water hoses. So far I've been playing with rotary pumps which need a high spin rate, and so a 1-to-4 ratio gearbox on the crank end is helpful. I've improved thr33d's derivation to capture all four planets for improved strength. The pump part doesn't quite work yet, but the hand-cranked gearbox might be useful to someone. Yes, I just used the hand crank from the Moineau pump and glued it atop. Why not -- I had one already printed.