Some more thoughts on color mixing... One obvious thing to do is simply to slice adaptively, switching colors between layers. For instance, to get 70% of black and 30% of white, simply slice a 0.07 layer of black and then a 0.03 layer of white (thickness to be scaled depending on desired layer height). That is trivial to do in most slicers. Of course, to generate a spatially varying pattern in XY you need to change the slicing heights within the slice (in the XY plane), but this has been proposed before and does not seem too difficult to implement.
... maybe I should just try that!
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