Homemade incubator:
Needed: one styrofoam beverage cooler, or any square cooler/styrofoam box with a lid.
One sheet of 1/4" wire mesh just smaller than the inside of the lid
one accuarate thermometer
one basic lamp that only has the cord and light socket left
duct tape
25 watt bulb
a small square of glass or thick clear plastic for view window.
a few lids to mayo jars, or similar. Even a plate will work. (these hold water and support your mesh wire)
more tape (duct or masking)
a pencil to stab some holes
Take the cooler, and turn it upside down. the top is now the base. set water holder(s) in, and place wire on top. (I like to zig zag fold wire a bit - looks like an acordian- to hold eggs in low areas better.)
Now for the new top (formerly the ice holding section) take your light bulb holder and use it to mark a hole cut in top center of cooler. make the hole (knife works), stick in light bulb socket, then duct tape it and the cord to the top of cooler, so it won't fall in. The bulb should be able to be put in by reaching iinside now. You just look in and see a bulb from the inside. test that light works. proceed to decide where you want your view window, and carefully trim styrofoam to allow the window to be put in. (I leave a little lip to support it. Tape the edges.
Now, get a shot glass or something similar, and tape your thermometer so that the bulb falls about the middle of egg hieght. Put it into the incubaor, and put on the lid, and plug it in. Use pencil to make about 10 holes around the bottem, just below egg wire. (air must be able to get in here!) Now, make about 20 holes evenly spaces around top of incubaor, just below the "roof". I do 7 on long sides, and 3 on sort sides. Give inicubaor 12 hours to warm, then start putting tape over holes (as needed) to keep in warmth, or uncover to cool. Always leave 2 bottom wholes open, and 4 top ones for proper air flow.
You will have to adjust this daily. Remember to turn eggs about every 4-8 hours. This is a STILL AIR INCUBAOR/HATCHER. That means you want a temp of 101.5-102 at the height of center of eggs.
Thats it. I've used this when incubators broke down, and for hatching lots!! I often have mixed eggs in my big one, so I just take them out 3 days before lockdown, add lots of water for humidity (and a wet sponge at hatching time). You will need to keep an close eye on water in bottem. The light can be drying.