pop-open easter egg

A hollow (easter) egg, originally designed to hold a treat and be hidden for our dog, but would also work perfectly for kids. Because of that it can be opened by just pushing gently where the two halves meet, as shown here:
https://youtu.be/huxWthhCa_I

It's highly recommended to print this in PETG or similar filament, so it's flexible and strong at the same time. The wall thickness is optimized for a 0.4mm nozzle.
The two parts should fit snuggly together, but not with too much force. If you know your printer to over-extrude, consider to dial down the extrusion multiplier a little.