My take on a stackable egg tray for holding quail eggs, 25 eggs per shelf. 
 

Note - the photos with eggs are of an earlier prototype the hight of the legs has since been reduced a little to make them more space efficient.

Note - the legs are quite a tight fit but with a little work will slide on with a little work, this is so they don't have to be glued together allowing for the shelves to be dismantled if required. 

These were printed with a 0.6mm nozzle, 0.35mm layer height, 2 perimeters, 5% infil in PETG.

I have included STEP and Fusion360 files for anyone wanting to make their own modifications.