Egg
thingiverse
You need to print the same part twice. This will create one half of an egg. When you're done printing, you can assemble the two halves together. Don't worry, I haven't printed it yet, so I'm not responsible if it doesn't turn out right. The 3D model fits perfectly.
Download Model from thingiverse
With this file you will be able to print Egg with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Egg.