Had this hotwire styro foam cutter in the garage, I made it years ago to cut segments out of styro foam.
Today I needed to pack some shot glasses securely, for in the post, hence I got the hotwire out, and made a cut out from some old block of styro foam i still had laying about.
Transformer 200 VA , 240 / 21.5 Volts. I added 10 turns as secondary from 2.5 mm². Current about 15 Amps, cutting wire is some old steel wire 1mm².
It works well. Of course the distance between the terminals can be made bigger but was not required in my case.
I created this video with the YouTube Video Editor (http://www.youtube.com/editor)
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