They seem to work fine. I put one on my Elgoo Mars last week and it seems to help reduce abrasion and (theoretically) prevent splatter from getting into the gap between the case and the LCD. I'm deducting one star because of the difficulty installing the vinyl. This piece has a slit down the center of the pad, making it almost impossible to get it on right the first time. I had to tape, pull, tape again, and pull up (etc) the vinyl until I got it centered. It works, but since it ONLY needs to be RIGHT so it doesn't obscure an important part of the LCD, you'll have to be very finicky to get it right.
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