Repraps can also reach those tolerations,

Mine has a precision from about 0.1 - 0.2 mm, in the X and Y most of the time dead on (standard caliper (0.05 +-))
The height well, the lowest layerheight i've tryed is 50 microns (0.05mm) and went pretty well.
But the Z can sometimes be off for like 0.1-0.2mm, depends how well the Z is calibirated.