This year, I've given my eggs a wider base, making them much more stable. I've also replaced the magnetic attachments with a simple click mechanism.

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To open the egg, grab both halves, wiggle & pull apart. The bottom half has a slight ridge on 2 sides that clicks into a groove in the top. Because of that, it's easier to separate them wiggling in one direction than another. If wiggling one way doesn't work, try the other. It does get easier to open with use. When the pieces are together, hold one side and twist the other 360 degrees a few times and it will loosen up dramatically. You can also encourage it a little (if necessary) with a little sand paper.

Both pieces can be printed “right side up” so you can use 3-color filament or rainbow filament and have the colors match up.

I've sliced it at 100%, 70%, and 50%. At those sizes, the eggs fit inside one another like Matryoshka dolls. As you scale them down, they get easier to separate. If you want to create a larger set, you should be able to scale above 100%, but I haven't tried it.

If you find the pieces are slightly tight, just put them together and pull them apart a few times. If they really stick, sand them a little or reprint them after re-calibrating your bed, adding more elephant foot compensation, decreasing flow, or a combination of these.