Anyone know what causes/fixes this wonderous effect? Had 2 printers do it after getting a dodgy batch of ink (last time refills are used). Sometimes covers the entire sheet.
Gave them both a good clean and changed the ink and drums (genuine HP now).
One of them appears to be ok the other one doesn't appear to be any different.
Only does it some of the time (1 in 4) and does not do it if you print in black and white.
Short of dismantling it at Easter and giving it a really good clean I'm considering just getting a new printer.