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Where have you found a phototransistor that can stand the 250V trigger voltage of a "high voltage" flash like my old Sunpac 411?
You might want to think of making a thin hot wire cutter to use in place of the laser. I've cut a number of polypropylene wing cores with stainless steel wire and a low voltage. high current hot wire.
Stainless steel safety wire works quite nicely. Used it to cut polypropylene wing cores for combat foamies for a couple of years.
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