This question asks about computing the fundamental layer height unit for full Z-motor steps, on the basis of a theory that layer thickness can be inconsistent if the height is at different micro-stepping positions on different layers. The specific printer mentioned in the question is an Ender 3, which I also have, and while I've wondered in the past based on this video whether using whole-step layer heights helps, I haven't seen conclusive evidence that it really does.
According to the research in How Accurate Is Microstepping Really?, the A4988 stepper drivers (which this printer uses) have near-linear microstepping response, at least under the test conditions, which suggests there's little or no benefit to using whole-step layer heights.
Has anyone done experiments to determine/demonstrate whether use of layer heights that aren't whole steps actually leads to extrusion/layer adhesion problems or other structural or cosmetic issues?
I did a quick test with a 20 mm cube and 0.2 mm layers (5 full steps, left) and 0.1975 mm layers (1 microstep short of 5 full steps, right) and there is no readily apparent difference:
And repeated with single walls: