I bought this for my Elegoo Mars which unlike the Photon only has a metal ring in the vat. Because this FEP doesn't come with pre-drilled holes (making it universal for many resin printers), it's very difficult to get it to work with Mars. Mars is designed so that the screws go through the ring and then into all parts of the FEP, after which you slowly tighten the screws one over the other to allow the FEP to sink firmly and evenly to the bottom of the vat. The Photon has two metal rings between which you can first insert the FEP with additional screws and then attach it to the tray. In this case I think you could just slip those screws through the FEP and you'd be fine, but if you try it on Mars you'll just end up with a sloppy loose FEP. Also, as others have said, they packaged the scrapers right against FEP so they were pressed right up against the scrapers and had a pretty noticeable dent on them. Each sheet had the same division, but to a lesser extent. So the one to the right of the scrapers had a pretty big dent and the one behind had a smaller dent until the last two FEPs didn't have a big dent at all. Can't tell how the dent affects the gasket as I couldn't even put mine in the tank to test (see first paragraph). I'm coming back for pre-drilled FEPs.
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