This Easter egg unscrews to allow you to include small candies or dollar bill, which will be thoroughly enjoyed by the next generation.

The original design approach was provided by Vladimir Murano on DesktopMakes.

I offset the thread faces 0.1 mm so that they screw together more easily.

With this approach, the crack between the two sides essentially disappears.

I also added a 12 mm diameter flat bottom so that is stands easily.