The ideal layer height is a multiple of a single step of the Z-axis stepper motor (positioning precision). Example Ultimaker: single step 0.05mm: Layer heights of .10mm / .15mm / .20mm are ideal
How much does the Z-axis of the A1 Mini move with one step of the stepper motor?
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I know this is old, but to my knowledge it’s something like 0.01 mm. That’s the number shown for accuracy in all three axis, the step distance is likely in the same neighborhood as the ultimaker, but most modern stepper drivers use micro stepping. Many can divide each step into hundreds of micro steps.
In a similar situation, Creality updated their K1 stepper pulleys to ones with 50% more teeth on them and still retained the same accuracy in X&Y.
I would guess the physical slop in almost any printer would hinder accuracy long before step size. The A1 mini has about .01 mm of Z axis “movement” I won’t say slop because it’s more of a frame/cantilever bending than backlash. Also, it takes quite a bit of effort to cause, so in normal use the movement is darn close to zero.
Prusa recently started using .9 degree steppers on the MK4 printer, it doesn’t seem to have made much difference over the 1.8 degree models, except maybe a higher tone and less peak vibration.