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dbr-
That's moot since velocio has already found a shop which can do the work he wants, but in general there are shops which are familiar with working at that level of detail in all materials. <1mm cutting is not available in every shop because many shops don't have the RPM on their spindles to work at that scale, but it's also not uncommon.
gbj_tester
LMGTFY...
Obviously I checked before posting, which is why I said 0.8mm (widely available) rather than my first guess of a small diameter long cut length routing bit which would have been 0.75mm
They're (anything under 3mm) usually either 3mm or 1/8" shank regardless of cutting diameter
Obvs. You'd only use the little cutter for finishing the internal corners.