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Originally Posted by |kbn|
Plastic (polyethylene or polycarb) is so much easyer to machine and is quite easy to seal, so is best imo.
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Yes. A good quality chopping board costs little and is a joy to machine. Great for prototypes. The stuff also sands easily to the gloss of magazine paper. Metal grit and oil ruins its appearence though.
Brass is much stronger than copper. Purely structural elements (everything but the base) is better made of brass. You can use less metal that way.