Oddly some printers just seem to be immune from clogging. I once let a Canon iPF 6200 sit idle for over six months and it fired right up without clogging. In fact, I cannot remember either my Canon 6200 or its successor, the 6300, clogging ever. I once put a Canon Pro 9000 in storage with the ink tanks in place for almost five years. When I plugged it in, it went through an extended cleaning cycle automatically and then printed flawlessly. I too, like the OP, have let my Epson 3880 for over six months without use, and it produced a perfect nozzle check the first time. OTOH, my Epson 7900 sometimes cannot go more than two days without a clog, but then I've also had it sit for a month and not need a cleaning.