I don't know what the limit is, but I've dropped twelve or fifteen cards in the 3880 without any feed problems. As to your other question, for whatever reason, the 3880 seems to immune from the normal Epson clogging problems. Mine sat once for six months without use, and when I did a nozzel check, it was perfect. In fact, in the three years I've owned it, I can only remember having to run a cleaning cycle once.