Oh... the sample links are all dead. They were made by previous KCC maintainer.

For now, here's some kindle scribe samples. The mobi can be usb transferred, the epub can be sent via Send to Kindle. They might look fine on other Kindles, let me know! Otherwise I can put up more samples.

https://www.mediafire.com/folder/ixh40veo6hrc5/kcc_samples

Edit: added more kindles/kobos/remarkable, lmk if I made any errors! only difference is resolution