i recently bought the 730ps printer and used it for the first month without any problems. my next prints started having hairlines and stains on the picture. i wasted the last 5 prints off a pack from trying to figure out what the problem was then bought another paper pack and a cleaning kit. also wasted another 10 prints just to realise its dust that has gone into the thermal head and it wont be cleaned after using the cleaning kit thoroughly.
i had to go to the extreme - using my hoover! it did the job just for dust to be on the thermal head 3 days after!! i decided to place the printer on my workdesk instead of on the floor.
if you ordering your printer, it is worth getting a dust cover and do not place your printer on the floor.
Hi-Ti be a little bit honest to your customers and try resolve this dust sensitivity!!