Arcade speaker trim
thingiverse
It is a trim for the methacrylate that covers the speakers of an arcade machine. You can see in: https://www.youtube.com/watch?v=NFlyAQNa4Hs I suppose that it can be used as a stiffener for any object that you want to cover, since it can be resized. I have posted the originals in case someone wants to modify them.
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