Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4588378.

The kids were quite impressed by some of the popular "Surprise Egg" models, however I was quite disappointed they were encumbered by a NoDerivatives license. Only one thing for it, make my own customizable version free to share and modify. Here it is.

Can be used as a general purpose hollow egg of custom size, or start with a blank slate and subtract your own model for snug fit. Print-in-place, no supports (makes use of bridging for hollow version).