The SP 4000's new one-inch print head packs eight ink channels and 180 nozzles per channel. When combined with Epson's Variable Droplet Micro Piezo DX3 Technology, the print head produces variable-sized droplets as small as 3.5 picoliters, up to 2880x1440-dpi resolution, and shorter print times. Only seven ink channels are used at a time in the Photographic mode. When applicable, the printer automatically switches between Photo-Black ink and Matte-Black ink based on the paper settings. There's also a four-color Dual print mode that saves photo ink when printing CAD or graphic signs, and for further saving, you can use the larger ink cartridges from the Epson SP 9600. We also like the printer's time-saving auto-head alignment feature and the built-in paper cutter.