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what is the best way to make your own hot knive for cutting 2" pinkfoam board? Answered

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Take a resistor wire from an old electric heater. cut a 6" length. attach it to an old train transformer and turn up the power until it cuts smoothly without burning.

I use an old wood burner with a modified tip it works great

get some high guage wire, and short a battery with it

you could just take a hacksaw blade, and attach that to a 40W soldering iron

Yeah, hobby stores (such as model railroads) usually have foam cutters that have a handle and a wire stretched taunt which is then heated to cut the foam. My dad has one and it works great.