There are other reasons the Z3100 is an inkjet printer's dream, however. It has a built-in 40GB hard drive, for spooling files and storing profiles. It has a Web server, also built-in. It has user-replaceable heads, six in all, kept consistent over time by the printer's automatic calibration. Most important, though, is the fact that the Z3100's Vivera pigment inks, which include red, blue, green, and four separate blacks, produce stunning yet subtle color and monochrome print quality.