Peter Fitzpatrick over at Shouting Into The Void make these:
Printable, Cut-Up, Fold-Up Doors
I haven't tried them yet, because I'm out of color ink, but they look about right eyeballing them at 100% size. I think I can make some to replace my occasionally difficult Dwarven Forge doors. Especially if I put some tape on the bottom so they'll stick in place on the battlemat.