With my last batch of incubated eggs, two of the eggs were cracked when they rolled into each other during the day 20 shuffle. I created this to keep the eggs from rolling around. The ten eggs I used them with all hatched fine, and the chicks seemed to have no problems getting out of the shell/holder.

Full-Size Chick Eggs: Print with a brim and pull it off or don't even print the brim

Bantam Chick Eggs: Print with a brim and leave it on. It nicely shrinks the opening of the holder

Bambu A1

Layer Height .2 mm

Supports: No (print flat side down)

Raft: No

Infill: 15%

Filament: Generic PLA

Time: 33 minutes

61mm x 78mm x 18mm