The newer printers like the 7900/9900/7890/9890 were designed to reduce clogging, but it appears that they have numerous issues with clogging. The good news is that with the use of cleaning/lubricant fluid prevents the capping station from drying, which in turn prevents the head from drying. This method has been applied to our customers for over 10 years since the introduction of Roland and Mimaki printers.
We have an Epson 9900 as well as many other printers and apply the cleaner once every few days, especially on Friday evening. We have had no issues with clogging, so we know it works, not to mention thousands of clients have bought cleaning fluid over the past 12 years from all over the world.
It seems that salespeople follow their prime directive, sell. There is nothing wrong with that except where the client needs to know how to take care of their purchase. This is a grave issue with inkjet printers. People seem to believe an inkjet printer does not need maintenance, replacing of parts or any cleaning.
Everything we own that I can think of that has moving parts at some time needs replacement. Everyone knows that cars need oil changes to keep the valves clean, but there is so little discussed about cleaning the capping station pads, the wiper, and the head. Inks are composed of pigments and resins (liquid plastic) and when they dry on the capping station, they form a gunk that prevents ink from sucking properly through the capping station. As the wiper cleans the head, it picks up ink which dries on the wiper and in turn prevents it from cleaning properly.
When purchasing a Roland or a Mimaki you are instructed to clean the wiper and replace it on a regular basis about once a year. What is different between a these printers and Epson? Basically, nothing! Roland even has a CD on how to clean the printer.
We have created several cleaners to remove clogs, prevent clogging and to clean out the entire line from ink bay to capping station. Read more about our support for clearing clogged print heads.
There is another issue regarding these printers and it mainly relates to the Light-Light Black Nozzles. It seems that a great many printers using Epson ink have reported on several user groups issue with this channel not clogging, but have electrical burnout where the head will not fire a group of nozzles. Some people have gone to great lengths to test their printer by removing the head and gently injecting distilled water through the LLK nozzle channel. They witnessed perfect flow, but still the head showed the same nozzles not firing when placed back in the printer. There have been no reports of this occurring with any other brand or type of ink.
One could argue that Epson should solve the problem and while I would agree it is our responsibility to take care of our own printers.