a130 hobby motor driven peristaltic pump with optical encoder

thingiverse

If you're seeking a parametric version of this model, it would be wise to consult directly with its designer. A note on the materials used: this project utilizes ABS plastic and food-grade 5mm silicone rubber tube. Its creator's work is based off an existing design available on Thingiverse: http://www.thingiverse.com/thing:53451; take some time to familiarize yourself with how it prints on a RepRap. You will first need to print the ring, then adjust the mandrel gear scale accordingly to achieve proper pressure for the tubing. It is imperative that you follow this process precisely as ABS plastic undergoes different cooling rates which cause shrinkage issues. To assemble this design correctly, it's likely going to take some trial and error; fitting both halves together will probably feel like solving a puzzle piece by piece. Make sure to apply even pressure by pushing both parts simultaneously, ensuring that they are also rotating in unison at the same time. If necessary, use drilling tools to clean up the 3mm holes designed for photo sensors and LEDs; otherwise, you might need to improvise accordingly.