The chicken stands up just as the egg pops out, so the egg drops about 4 inches.I use pine shavings because that’s all I had last time I put them in there. Most of the time I use straw.
If there's not enough shavings or straw, the pointy end of the egg may get a hole or crack.
The nests need a 3 to 4 inch lip to contain the shavings.
Chickens love to eat egg shells, so you may only find the liquid in the nest, which gets all over the other eggs. GCI don’t ever find a broken egg shell but I’ll occasionally get a cracked egg