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I wonder if you could fashion a heat sink of some sort? Like a block of aluminum or something physically attached to the blade (without damaging it) during the etch process...
Or would the heat be...

I don't know, but I do know that laser etching is very fast, and produces very little heat. I'm sure that's a little dependent on the type of laser used though. NdYAG I believe, produces less heat...

BC, I was subscribed to a thread that mentioned that - as well as custom monogrammed scales. I believe it was a post by "kyle76" that mentioned it.