The instructions don't mention this, but the FEP has a protective film that needs to be removed before installation. How do I know? you guessed; I installed it without removing the film layer and when I finished my first print I noticed these creases in the middle of my FEP sheet. It was a protective film separate from the FEP. If you look at the long edge you will see two layers and you can catch them with your thumbnail to pull them apart. I lost 2 FEPs due to poor instructions. Like most 3D prints; It's a frustrating learning curve when you make mistakes and waste materials trying to figure it out.
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