It's my first attempt of using Fibonacci sequence to create a flower.

The petals form a golden spiral and several spirals form a flower. In the customizer, a larger `spirals` makes the petals density higher, and a larger `petals_per_spiral` generates a bigger flower.

After generating or downloading a STL here, scale up it to the size that your printer can print the smallest petal.

The printed thing here, for example, were enlarged to a scale of 1:3.5.