I know it's funny, but I would like to print some booklets I have. They are in ePub format without DRM, and my idea is to create a booklet in A6 format (they are not very long, otherwise I would not print them!)
Which suggestions do you have?
Instead of converting with Calibre, you can directly print from the Calibre book viewer¹ and use a (virtual) printer driver that supports booklets construction on the fly.
On Windows and OSX these are more common. If you are on Linux you can easily create by installing CUPS,
psutils and a few lines of code for the backend
¹ At least from the viewer included in Calibre version 1.17, probably earlier
If you are going to use Calibre to convert, and if you have windows on your PC. I would convert to RTF. You can easily open the RTF with MS Word or LibreOffice Write, make any minor changes that might be needed and print.