Update 7/30- Added a version without pins for those who asked. Also added a second version of the original re-oriented and with larger, flatter base on the bottom piece.
If anyone wants to remix this thing to close with a lip instead of pins please let me know and I'll post the eggs before I added the pins.
Printed using PLA at 2.0 mm without supports and scaled to to over 1000%. Print the base standing straight up and print the top with the wide end on the platform. I used Simplify3D to make 1 process with 50% infill for 10mm on the base of the bottom so it has some more weight and less likely to tip. The rest printed with 20% infill.