Peristaltic pump with planetary gear

thingiverse

Peristaltic pump based on Ralf's "Low cost peristaltic pump" that can be driven with only one 28BYJ-48 stepper motor thanks to a planetary gear built directly into it. Geometry of the planetary gear from Parkinbot's "Hi-ratio evoloid planetary gear". The original one wasn't built to be fast and this one is even worse, keep that in mind if you want to build it. Although the cog built into the roller prevent it from spinning freely since the diameter of the ring of the planetary gear it's pretty close to the diameter of the tube inside the pump when pushed, the rotation of the roller it's pretty much identical as if it were left free to rotate.