I have been printing on my SP3800 with matte black ink for the past couple of months. Prints have been fine, occasional nozzle checks have been perfect, all 180 nozzles firing for each color. Today I switched to photo black ink, via the printer's control panel, after checking the ink levels. Then I checked the levels again. The photo black was down by 5%, all the others were unchanged. At $50 per 80 ml cartridge, this was $2.50 in ink cost - not bad at all. Then I printed a nozzle check. Oh-oh. Only 6 of the black nozzles were printing, while all 180 nozzles of each of the other seven inks were printing. So I did a head cleaning. So far, so good. Now 126 of the 180 black nozzles were printing, and all patterns for the other seven inks were perfect. (I know, I'm compulsive - I used a loupe to check!) We are almost there. I did a second head cleaning cycle. Things begin to fall apart. Nozzles not printing were as follows: PB, 8; LB, 12; LLB, 78; C, 0; M, 0; lC, 26; lM, 15; Y, 58. I did a third head cleaning cycle. Nozzles not printing were as follows: PB, 0; LB, 0; LLB, 0; C, 0; M, 63; lC, 13; lM, 6; Y, 12. Better, but not there yet. After a fourth head cleaning cycle, all nozzles were printing, except for the bottom 4 of the M channel. I decided I was done. Checking the ink levels at this point, all 8 active inks (MB not in use) were down by 5% each from the levels prior to the four head cleaning cycles. Cost of this wasted ink: $20. Is this the sort of thing all SP3800 users experience? I cannot understand why the head cleaning procedure should mess up the ink channels not involved in the MB/PB switch. I can understand how the PB channel would be affected, of course. It seems to me Epson could allow only an affected ink channel to be cleaned, unless the cleaning procedure uses a vacuum applied to the entire head and all ink jets. This experience suggests to me that a better procedure for getting the black channel to print after a MB/PB switch would be to print a dark black patch, rather than running cleaning cycles. Any suggestions or observations from other SP3800 users?