I tried 6 times....
First, I made a ball.
I worked in order of rough cut to finish. This time we used ModelaPlayer4.
Mill: rough> 1/8inch square finish>1/8inch ball
Setting: material>ModelingWax othersettings:All defalt
The silicon is harmful , so I wore gloves.
I put a coagulating agent in a silicon agent and mix it.
Pour it in the model.
I mix two materials with quantity by 50%.and pour.
I enlarged the hole and added an air hole, but failed all. The form does not seem to have a refuge of the air.
As in the figure, I modeled it and did all process again.