To verify if this case is compatible with your e-reader, you need to check the serial number, the first four digits have to match one of these: B001, B0C6, 90C6, B0DD, 90DD (source). The other Kindle case I have designed is the Kindle Paperwhite 3rd generation. Some of the models are designed for rigid materials and others for flexible ones. The models materials are not interchangeable, so pay attention to the file names. If you have any request on the design just ask me.
2021 is the year when most of country started the covid-19 vaccination; that's why I added a design with the 2021 with the "0" as a virus silhouette and the "1" as a syringe.
For other phone cases check this
Here is the explanation of the files names:

Flex: made for elastic filaments like TPU. Not tested.
Rigid: made for rigid (non-elastic) filaments like PLA, ABS, HIPS, etc. The holes for the buttons are opened on the front side. Tested only on PLA.
Banded: It has regular horizontal grooves in the bed surface, to make the finished texture more regular, avoiding irregularities on that part, and with a better grip.

I spend part of my time making these models, letting them available and free for everyone. If you want to support my work, you can contribute with me here:

"E-reader" results