The resolution of the 0.25mm nozzle is no longer limited by the nozzle design, but by the amount of steps of the feeder. When you go below 0.06mm layer height, it can happen that the amount of material that should be extruded is less than the amount extruded by one step of the feeder motor. This means no material will be extruded when trying to print really small features.
From what I've seen, the difference between 0.06mm layer height and even lower layer heights is hardly noticeable.
Good question. I haven't tried the .25mm nozzle yet but I have one (I have a .15mm also).
I'm just guessing. Either no one really proofread the specs carefully who had tried a .25mm nozzle. Or it might be that you really can't go lower than .06mm layer height for that nozzle.
PLA is kind of gunky/sticky as you are printing and it sticks to itself like snot or like a liquid rubber band. When printing very thin layers it may be that it has trouble and these liquid strands break and don't print so well when it's so thin to start with (.25mm across). I really don't know. Hopefully someone else knows the answer.
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