I will agree that a .012" cutter is a rather small diameter.
But what's the big deal?
No problem - OK maybe need to take 3 roughing passes instead of 1.
I figure they want tapered sides so that they will get almost 0 backlash.
In a lot of cases a design like this is made by an engineer who knows very little about machining manufacturing.
Talk to them and you can likely get them to change the design to something you can cut with a standard slotter
or maybe a standard V cutter.
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