Inspired by graphing calculator covers. But I have included the fusion360 file because it is a little rough on the side switch when you put the device in with the screen out. Works great to protect the screen when it's in your pocket or bag, but I wouldn't use in the other orientation just yet. I'll work on some more ideas and see if I can improve upon it.
I flattened the bottom to make it print easier vertically on its end, but the inside is contoured to the device.
The author marked this model as their own original creation.