The 3880 (and the 3800 it replaces) has 9 cartridges. This set includes Matte Black and Photo Black so the user can switch between these two blacks depending on PAPER choice, NOT whether you are doing B&W or Color. Your reference to "cartridges to be swapped to do B&W prints" is a bit confusing. The 3800/3880 series of printer has three blacks; Black, Lt. Black and Lt. Lt. Black. The printer has the ability to print beautiful B & W whether you are using Photo Black for gloss surfaces or Matte Black for matte surfaces. I hope this answers your question.