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I have written one that can do it. It basically calculates a negative hull around a 3D object. Each color pixel is then converted into a thin long box, creating a very detailed 3D model where every box has a single color. Those can then be easily sliced, and the result is a monochrome filled slice with an arbitrarily thick shell in color. I use parts of OpenGL to calculate and render that, so the output is fast. My test model has a few thousand facets and renders a slice in under 3 seconds. I’ll be happy to share the code, but first I want to see a working 5-color printer 😉