I tried 6 times....

Molding

Making data

First, I made a ball.

ball

cutting

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

pouring

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.

casting

I mix two materials with quantity by 50%.and pour.

fail & 2nd one

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.

data

rhino data stl