What is the difference between printing at 1440 dpi and 2880 dpi?
When you print at 1440 dpi, the 3800 lays down ink using two different ink droplet sizes, leading to a dot pattern containing both large dots and small dots. When you print at 2880 dpi, the 3800 uses only the small ink droplets. Printing at 2880 dpi takes about 1.9x as much time as printing at 1440 dpi. For example, an image that takes 3 minutes to print at 1440 dpi will take about 5:40 minutes to print at 2880 dpi. Printing at 2880 dpi uses roughly 10% more ink than printing at 1440 dpi (not twice as much, as incorrectly suggested elsewhere on the web). The differences in print quality between 1440 dpi printing vs. 2880 dpi may or may not be visible, depending on several factors, including the paper surface, the lighting and viewing conditions, and the eyeballs of the person in question. See this question for more details.
