All you need is:
-Styrofoam (expanded polystyrene)
-A towel or ironing board
-Common sense and safety
WARNING: DO NOT ATTEMPT TO THIS INSTRUCTABLE. IT INVOLVED HIGH TEMPERATURES THAT COULD CAUSE SERIOUS BURNS, PROPERTY DAMAGE, OR EVEN FIRE. THIS PROJECT MAY ALSO GENERATE HARMFUL FUMES THAT COULD CAUSE PERMANENT BRAIN DAMAGE.
I AM NOT LIABLE FOR WHAT YOU DO WITH THIS INFORMATION!
I hate disclaimers (but I hear getting sued is worse).
Step 1: Preperation
Plug in the iron and let it get hot. The temperature doesn't matter, but if it hotter it will melt faster. I'm not sure but when it gets hotter it probably releases more fumes.
Take your Styrofoam (I use packaging from a printer and spacers for bottles) and break it into smaller pieces (about 3"x3"x2"or about 80x80x50 mm) The size doesn't matter, but it makes it easier to melt.
Step 2: Melt it!
Place the foil and foam on your towel or ironing board and slowly press the iron down on to the foil. After a few seconds the foam should start melting. Keep melting it until it is only about 1/8" or about 3 mm thick. Take the iron off and let it cool. After it is cool peel back the aluminum foil. If you want bigger pieces repeat this process several times.