Strobing Bottle Fishing Cap Invention 2 Liter

thingiverse

This is a clever gadget I whipped up for nighttime bottle fishing. Just slap in some batteries and a flashing or steady LED, and you're ready to roll. It makes tracking down those bottles as the fish snatch them up a breeze. You might need to crank up the print settings to 100% infill to get it watertight, or add an O-ring for good measure. Originally, I built this thing to run on a single AAA battery, but the LEDs I had required at least three volts, so I jury-rigged it with some tiny button cells from another cheap light.