Convert epub file to pdf : are there new solutions with a high quality converting?

I would like if threre are new solutions to convert with high-quality an EPUB file to get a PDF.

I read the following post which tells that best converting is performed with “calibre” :

I tried this solution with “calibre” but results are bad. a lot of text is bad spaced in the output PDF. I illustrate below this :

I show you here only one of the first pages of my EPUB book, actually, there are a lot of errors like that.

To generate the output PDF, I have used the “print” option in ebook-viewer of calibre.

Coul anyone tell me if there are currently other solutions to convert EPUB file to PDF file with a high quality about text formatting and equations ?

Or to summarize, what is the state of the art for EPUB-PDF conversion ?

Regards