Grandad - I didn't mean to imply that the ink residue that condenses inside the case was a problem. It doesn't alter the function of the printer, and it cleans off easily with windex. I would guess that in the process of the Epson piezo-electric device "squirting" the ink onto the paper a minute amount of ink would vaporize and some would condense on the inside of the case. The Epson actually had more ink residue accumulated in and on the case than the Canon! I sometimes failed to do the page setup properly and ended up with the printer trying to do a landscape oriented print on paper that was set up as portrait. This caused some ink to spray where there was no paper to receive it and probably accounted for some of the evaporation. In the Canon it may relate to the borderless printing in which some ink is discharged beyond the edge of the paper inside the printer. Almost all of my printing is borderless. That is actually one of the reasons I changed printers - got tired of all the trimming after printing. Much easier to occasionally clean the inside of the printer case!