Remixed the brain MRI to hold a magic 8 ball.

It supports 3 different sizes of Magic 8 balls. I tested with the 1.5" version in the 50% scaled brain. There are two sizes of brains, one is 50%. For a total of four brains Download the one that matches the diameter of the magic 8 ball you are using. 1.5", 3.3", or 4".

To assemble you can use two 5/16" dowel rods cut to less than 1" in length. This helps with alignment. Orient the magic 8 ball so it will be visible at the bottom. And adhere with a flexible glue like E6000 or a glue gun. I used rubber bands to clamp it closed for drying.

I printed with Geeetech transparent TPU so it would be kind of squishy, In Cura I used the following infill Cross 3D at 20%.

I used the World's Smallest Magic 8 Ball, which wound up being 1 1/2" in diameter. https://www.amazon.com/gp/product/B01D1WI758

This one is 3.3" in diameter https://www.amazon.com/dp/B09ZVL3NR3

This one is 4" in diameter https://www.amazon.com/dp/B085G63Q36