This is a large spudger. It's for separating things that are stuck or mechanically clipped into other things.
You can see it in action on Youtube https://youtu.be/KA9Ap2PJR8k
It was created to take apart a tablet in a PCBurn article: https://pcburn.com/tablet-teardown-of-the-u30gt-android-tab/
You may want to use short layer heights. I had good success with a print on PETG.. it seemed to have the right amount of flex to make prying apart plastic cases and separating Lithium batteries work.
The author hasn't provided the model origin yet.