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Hi Snowy,
Cutting foam - Not sure what high density camera foam is, but have some experience cutting polystyrene foam for model aeroplane wings. Best done with a nichrome wire heated with an electric current. Normally use 24v over about 900mm of wire. Nichrome wire can be from an old jug element or you can get it at Jaycar or Smick Dith's. If, however, camera foam is more like sponge rubber, would suggest a band saw or even an electric knife. A Dremel type high speed rotary tool may also be useful if you are hollowing out small sections.
Regards,
David.
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