Held my breath and engraved my old iPhone 7. Used the proofgrade settings. It worked just fine… a little light (which could have been the sketch) … but it worked. But, FYI… there are plastic bands on the top and bottom… the laser doesn’t like that area. It burns it. Should’ve thought about that… next time. !
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Good to know! 
This is one i did on my “shop” iphone 6. Lesson learned to use my alignment pegs to keep it from sliding. I had it on a screen cleaner to not scratch the screen.
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What settings did you use? Yours is much darker. I like it.
I selected Gold iPhone from the material options and let it rip. Didn’t tweak anything.
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I also engraved instead of score