the groove around the mold halves is for a clay bead to be inserted into one half, then when the halves are clamped together, the clay will form a liquid tight sealing perimeter within the mold, so mold mating surface perfection is less important than normal. trim casting flash away when pulling silicone out.
The included Dickolas.stl SHOULD NOT BE USED DIRECTLY OFF THE PRINTER!!! PLEASE be body safe and smart please.
The author marked this model as their own original creation.