Hello,
The latest download of Calibre includes experimental conversion to KF8.:
----------------------------------------------------------------------------
'calibre can now generate Amazon's new KF8 format MOBI files. To turn on this feature, go to Preferences->Tweaks and click Plugin Tweaks. In the box add: test_mobi_output_type = 'both' calibre will now produce MOBI files that have both the old MOBI format and the new KF8 format in them. To learn more about KF8, see:
http://www.amazon.com/gp/feature.html?docId=1000729511 Note that calibre support for KF8 is still experimental and there will likely be bugs.'
----------------------------------------------------------------
I've tried to follow the instructions - but when I do a conversion all I get is one Mobi file - no KF8.
Can anyone tell me (simple terms please) what I am doing wrong?
Many thanks,
Robert