Today i had the time to test the Open Exposer flex vat. And i can proudly announce that it is working. With the flex vat there is no need for a vat tilt mechanism anymore. It it also much easier to clean the vat and change the vat foil. Thanks to @Moritz for his great vat design files!
It is time now to work on better print results. The first task is writing a new Slicer for the Open Exposer.