I had a 100% hatch rate with mallard eggs and a 20% hatch rate with chicken eggs using a home made incubator. I made it using a small plastic cooler, a piece of black felt, a desk lamp and a pane of glass. I put the eggs in the cooler on the felt, placed the glass on top, leaving a gap and adjusting it when needed to regulate the temperature and humidity. I placed the desk lamp (the kind with a bendy neck) with a 60 watt light bulb in it over the glass and adjusted it until it was 100 degrees at egg level. I sprayed the eggs a couple times a day with a plant mister. This took a lot of checking to make sure the temperature was right but I had great success with it. I have yet to have another hatch as successful as those mallards... even with broody hens.