Planetary Peristaltic Pump

This is a fully functional peristaltic pump designed to be connected to a cheap stepper motor. I designed this a number of years ago while working on a hydroponics project. The goal was to monitor the water electronically and use these pumps to add measured quantities of nutrients into as little as three gallons of water as the plants absorbed nutrients. This required accurate measuring of small quantities of liquid.

It's languished /because there was an extremely fine tolerance between leaking and too tight to turn, and I couldn't get reliable enough prints from Shapeways.

I release these plans to the public because I don't ever expect to return to that project, and think someone else might have better luck.