The best cases for the Kindle were for the Kindle Paperwhite 11th Gen (2021), but I have a Kindle 10th Gen (2019). So I printed a case adapter for it!
Started with the f3d files from the Kindle Love Handles, and made lots of changes to make the outer dimensions of the case adapter align with the 2021 Kindle Paperwhite. Also split the case in half for easy installation.
The bottom of the case adapter is 0.4mm, so two layers. I didn't want to add too much thickness to the Kindle because it would puff up the case. There's also a cutout on the bottom of the adapter to maintain access to the charging port and the power button.
The fit onto my Kindle is just perfect (printed on my Ender 3) but tolerances might be too loose or too tight on yours. Thankfully they're quick and small prints so you can test multiple sizes. Try scaling up or down a few percent at a time.
I'm really happy with how it turned out!
The author remixed this model.