When I first ordered 7 eggs for our
Brinsea Mini Advance, the very nice lady added 3 extras (I didn't know sellers did this), so we scrambled to put together a homemade incubator using a styrofoam ice-chest for the extra eggs. Fortunately, we had all the supplies except for the water heater thermostat which I picked up at Lowe's. In just an hour or so my husband put the incubator together. We did have to tweak it the first several days, like moving the thermostat closer to the light bulb. Finding a good hygrometer was the most difficult part. We got one from
Petsmart called Fluker's and that one calibrated way off by 15% or so. After reading recommendations here, we got a
PETCO humidity gauge. That one calibrated spot on. We have done 2 hatches now and surprisingly the homemade has had a slightly better hatch rate than the
Brinsea. I have to give most of credit to rebelcowboys videos for our success. The homemade requires some watching.... temps/humidity can go up or down a little if the weather changes and we have to turn eggs. With the
Brinsea, you just have to add water. Despite having a better hatch rate with the homemade, the
Brinsea is a breeze to use, so much so that I just bought a
Brinsea ECO 20 for $89 (with FB coupon) shipping was $24. Hope this helps.