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Tiny polycarbonate parts (white) at 300 microns resolution, and ABS (blue) at 50 microns. That is 0.05mm or 0.0019 inches...
I have been working towards higher and higher resolution. I went for 10 microns and the machine will move it, but the plastic melts and runs out of the nozzle faster than it prints. Maybe turning the machine speed up will help.
More experimentation needed.