Mark H, you reported clogging on an R3000 unless you used it every day.
I don't think that is representative of the R3000. When i first got my r3000 5 months ago, it was good for at least a week at a time without clogging. I didn't test it beyond that. Then, thru my error in setting paper thickness, i had a headstrike event with a lot of ink smearing. After that, frequent clogging also occurred for me.
Following small Epson ink jet printer cleaning procedures illustrated in sites like Inkjetmall, I cleaned my print head face, and it resolved the frequent clogging problem. later on i also cleaned the capping station and wiper blade. Now i don't even bother to do nozzle checks and am not experiencing problems.
I've running 3rd party Cone pigment inks ever since my original set ran out.
I find it amazing that, as far as i know, that Epson doesn't address simple cleaning procedures by the new printer owner. at least i found all the necessary information on Cone's inkjetmall site.