A simple egg tray for 12 eggs. 
I created this to fit in a dridge tray witha width of 120mm and maximize the number of eggs it could hold. The other 12-egg holders I found were often wider and only 2-row trays would fit my fridge. 

The print is only 50g (PLA) and takes approximately 1h. 

This 12 egg tray fits on most print beds, but if anyonw wants I could adapt it for the A1 mini with fewer eggs.