How does it go through a normal-width door with the roll holder on? I don't think most doors are 31 inches wide (some are 26", others 30"... Can it withstand enough tipping (loaded with ink) to get it through a 26" door without spilling ink?
I'm really not interested in the 3880 - expensive sheet paper (tough to print 16x24 - 17x25 sheets are both very expensive and hard to find), last-generation inks and heads and it's only about $200 cheaper than the best deal I can find on the 4900 with rebates (plus the ink is nearly twice as expensive as the 4990's per ml).
I'll measure some doors, and if the 4900 is too big to fit, I'll just go with some 13" printer for much less money until I am settled enough for a 24" model.
I had to tilt my 4900 briefly to pass through two doorways. You should check with Epson about moving a printer with ink, but since they are shipping them fully charged, I wasn't concerned about the journey from my garage up the stairs.