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Old 11-20-2012, 01:32 AM   #17
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Originally Posted by DogFish View Post
I forgot to mention, the easiest way to cut foam is with an electric carving knife. I put a 1x4" board on either side of the foam as a guide to make straight cuts. Have the part you want remove extend out from the board like a miter box for cutting wood.

I haven't tried DogFish's method, but for thinner pieces I've had good results with a thin, very sharp knife.

For thicker pieces, I've compressed the foam between two boards (if they are two narrow, the edge will be funny), and then using a thin, sharp blade.

I've also heard of (but not tried myself) of people soaking the foam in water and freezing it, and then drilling into it (to make a foam prefilter or something similar).
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