I built my girls a lovely nesting box with three nesting compartments in it. From the day the first one started laying they used only one nest. Not a big deal, just that they would be standing there waiting for one to get off so they could lay or we would find two crammed in together. Someone on the forum had suggested taking some of the nesting material from the active nest and put in the others. I took some straw from the active one and put it in the opposite box and they have been using it! Good trick! I only wish I could remember who suggested it.