First, prepare the egg carton by grinding it into a fibre using a blender. The end result is a cotton-like texture.
To make the Thermoplastic Starch: In a cooking pot, add the cornstarch, the glycerin, the vinegar and the water, stir until the mixture is homogeneous.
Put over medium heat and wait for bubbles to start to appear, remove from heat and add the egg carton.
Pour into the mould, wait for it to dry to unmold. Then put it to dry in a dehydrator for 8 hours at 40ºC.