I have been following the testing of the NuVat by Evert, a very exciting development in the search for a PDMS alternative, and I came accost the catastrophic vat failure that Mike experienced. ( you can read about it here http://www.b9c.com/support/?mingleforumaction=viewtopic&t=2257.0#postid-23637 )
This got me thinking about a way to help protect the projector in case of absolute failure of vat integrity. My rough idea right now involves installing a peace of glass or acrylic over the window with a rubber gasket to form a seal around the window. This most likely would not stop all resin from dripping down in the event of vat failure due to the large number of other holes that the resin could flow through, however, it would prevent the resin from pouring into the projector through the window and should give you enough time to react to the problem.
This mod is not necessary for most users, however, for those who are actively looking for a PDMS alternative this might be a useful fail safe.
Here is a quick image of my idea.
My only concern is that adding a new peace of glass /acrylic to the system would affect print quality.
What do you think?