Rubber band powered torpedo pool toy bath toy

What should it be called? Little torpedo? Little rocket?

For kids to play with during their swimming holiday, this is the second version

Color:

    Choose based on the pool so it's not hard to find. Most pools are blue, so orange or yellow is recommended

Materials:

    1 608 bearing (NSK 608zz)

    1 rubber band (Kingdee S1006)

Infill rate:

    15% TPU/PLA floats, 50% PLA sinks, only these combinations have been tested

Materials:

    PLA, PETG, TPU all work. The best texture is 15% infill TPU, and the best feel is 50% infill PLA

**After printing, scrape the edge of the first layer with a knife to make it easier to insert the bearing**

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I consecutively lost two in the pool: one disappeared after being launched in the water, I came up for air and when I went back down it was gone; the other disappeared from the poolside

I guess someone took them

If that's the case, they seem quite popular

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