Self-Assembling Coral

When placed in moving water, these neutrally buoyant shapes self-assemble into interesting coral-like patterns and growths.

See here for video: https://youtu.be/aCJM2R2Kdmc

Print the “coral buds” with 100% infill. The pieces are designed pre-hollowed to achieve as close to neutrally buoyant as possible with the magnets in place. In reality, the pieces are slightly denser than neutral in part because achieving perfectly neutral is next to impossible and because it allows the option of filing off a bit of material if you would like them to float more.

Each “coral bud” requires six 1/8” x 1/16” cylindrical magnets. Insert the magnets side-to-side as pictured with the polarity consistent across all surfaces and all pieces. They can be press fit with pliers and should not require glue.

The pump base is sized for a 6” (OD) glass vase from a dollar store. The pump is a 3V submersible pump from Adafruit: https://www.adafruit.com/product/4546 . The legs of the pump base have platf