This is an egg I made using Meshmixer.

It therefore had a rabbit inside, naturally.

I have a printed version by an SLS printer (never tried FFF but should work too, you might however have to cut it) and once showed it to a toddler so the child would be occupied while I talked to the parents.

Can not recommend.

The toddler cried and cried because he could not get the rabbit out of the egg.

Removed it to avoid future catastrophies.