The only draw back is that acrylic gets gummy when hot and we are talking about a .040 in endmill here.
Geesh kinda scary! But I would love to see it etched out of acrylic!!!!
Come on guys lets put this into perspective. a 1 mm endmill has the thickness of a dime. the human hair is .004 and paper is .003 to .004 in.
Im wondering if we can get away with either a 3/64 or 1/16 if you want to know the MM equal remember the chart I posted in the machining preameters.
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http://forums.procooling.com/vbb/showthread.php?s=&postid=43808#post43808
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