Fishy the hinge...

thingiverse

This playful and whimsical goldfish model is fun to print because the individual coil sections allow it to flex in amusing ways. Kids and adults alike will enjoy making the virtual fish come alive by bending its body into spirals and curves. With its rounded scales linked by flexible hinges, the goldfish almost seems to swim across your desk when you move it. Its parametric design also means you can resize the fish as large or small as you like. Whether as a toy, decoration, or novelty item, this charming little creature is sure to bring a smile to anyone's face.