
I use a Canon MP620 injkjet, allegedly capable of 1440dpi. However using a variety of papers, printer settings etc, when I print out my drawing at 5mm diameter per dial, I all but lose the contrast, the markings aren't readable etc. When I scan my print (only at 600dpi) it doesn't look too bad.

viewed with the naked eye, it just looks like a black blob.
Is this just physics? do I need to make the markings overscale to get the same perceptual effect? or is there a means of increasing the sharpness/contrast at this scale? am I flogging a dead horse with a domestic, cheap printer?
I have tried printing both as a vecor and bitmap at various resolutions, any thoughts anyone?
Regards
Nick