Pi Camera v3 Case Back

What IS this thing? Where did it come from?
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I got a Pi Camera v3, which is a new upgrade, I know, but the dimensions are different enough (especially due to the autofocus module) that existing cases just weren't cutting it.

I wanted a mount that got the camera far enough away that I could see things well. I liked this mounting arm: [https://www.thingiverse.com/thing:4788832](https://www.thingiverse.com/thing:4788832) but it told me to use a case (not linked, but you should be able to find it on the linked thing's description.) which is designed for a PiCam v2. I needed something designed for a PiCam3 that I could make fit on that arm I liked.

Over on Printables. I found this case, which you will need if you plan to use this case back: [https://www.printables.com/model/368788-raspberry-pi-camera-mount-camera-module-3-version](https://www.printables.com/model/368788-raspberry-pi-camera-mount-camera-module-3-version).

I used TinkerCAD for t