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Many mechanical parts have nice curves around features in the outer shape of the part. This is good DFM (design for manufacturing) and looks good. Here's how to do it - Nice curves.
"Quite easy to use. Within only about 10 minutes I had it downloaded, installed, and had designed and priced a brass cog with 32 teeth, 1 inch in diameter and 1/4 inch thick. The quote was immediate."