A “hair” was a very specific measurement that I often heard used when I did construction years back.
Usually less than 1/16".
And by “hair” they usually referred to a very specific type of hair from a very specific part of the body.
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gender and color included 
Although I learned there were two measurements depending on which of the two colors that mattered (e.g. one was the reference for really small and one was a reference for thicker small). But I do like @Jules’ beard hair standard.
I had a misspent youth.
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My favorite unit of measure is the hair of a gnat’s ass. That’s like aircraft precision level right there, makes sense with gnats flying and all.
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Put the wood in the freezer overnight first. Once in contracts, cut it with the laser. Then place it in the inlay before it warms up and you will have a perfect fit. 
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Does freezing after cutting also work?
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Exactly 
!
I was trying to keep it PG, but yes those two measurements were often used.
No. Sorry, it was meant as a joke.
And yet…
If the fit on the veneer was tight, I would certainly consider freezing it for a while and then inserting it into place, letting it warm up there.
Not a bad idea at all.
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You just might, You certainly can steam wood into wonderful shapes. And they wet leather lashing before the are tied.
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No prob. I thought it was an interesting starting idea. I just thought the frozen wood would heat up while being lased and the method wouldn’t work well. So I asked about freezing it after cutting. I agree with Jules that this is not a bad idea at all.
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Ya never know where an idea may come from 
“ha ha ha… no wait a minute… maybe… hmmmm…” 
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I love those times where a really interesting idea is thrown out there and the phrase, “Strangely enough…that just might work” is said in all seriousness. GREAT things usually happen after that.
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I don’t know that wood would contract appreciably in the freezer due to temp - but I think you would see some contraction due to the low relative humidity and thus, drying the wood out. And then expansion from being “rehumidified” when you took it out.
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Nothing like a good dominance battle.
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Every bunny was kung fu fighting. (Sorry, had to.)
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