Crescent shaped hinged box

This is a nice hinged crescent shaped box. The shape of the body is described by this polynomial:

(6.67028*10^8 - 2.22107*10^7 x + 215584. x^2 - 796.532 x^3 + 1. x^4 +
63049.9 y^2 - 796.532 x y^2 + 2. x^2 y^2 + 1. y^4 + 129094. z^2 -
796.532 x z^2 + 2. x^2 z^2 + 2. y^2 z^2 + 1. z^4)

It uses 1.75mm filament for the hinge pins.