Just curious - I have the Da Yi back, and it seems to have an issue with the way the film gets rolled onto the takeup spool. There was virtually no tension on the film, and every roll ended up jamming, as the paper backing wandered over the lip of the take up spool.
There are two springs that I assume are designed to tension the film a bit (at either spool) but they were applying no pressure. I bent them to apply more pressure - better, but still have occasional problems. Any suggestions from Da Yi users?