I've been looking into different methods to get my toy's respiratory system working, and it looks like i can create it without using an aquarium pump. I've found a few different diaphram pumps that are small, low voltage, relative inexpensive, and claim to be quiet. I'm also looking into harvesting peristaltic pumps from basic inkjet printers, but am unsure about the pressure they can generate. My back up plan would be to develop a small bellows system that contracts and expands via a gear motor.
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