The new OLED is finally arriving today. Only took 1.5-2 Weeks to make it here from Robotshop
But maybe it was good that it took awhile, as late yesterday I got a reply from 4DSystems about the issue...
I'm thrilled to hear that you like your 4D product.
I also wish you all the best with your project. I would be very interested in hearing any updates on developments down the track.
In regards to the lines on the screen, this has come up on a few occasions. This is due to the flex being touched, bent or moved just as you say.
Unfortunately, once this happens, the problem cannot be rectified.
In regards to your housing design, you need to do it in a way that the flex is not touched or at least only resting against something.
If it gets bent, you will incur the same problem.
So if you look at the image (of the current one), where at the bottom you see the tan stuff, this can not be bent, which implies that the OLED probably needs to sit recessed slightly into the case to keep it from being destroyed (again). Probably need to make the hole a bit smaller...