Print fixed layout epub properly?

[cifroes]

I bought an ePUB and it seems like it's a fixed layout epub (all words are absolutely positioned on the doc). I know it's a troublesome format to convert but I just want to print it as is, each page on the epub to an A4/Letter print page.

I tried calibre viewer and hitting print but the text is all garbled up. I tried sumatra and hit print and it's much better but some diagrams are still messed up. Thorium seems like it doesn't have print option. epubreader for firefox also doesn't work. Also tried Icecream and Freda and it also doesn't work. Also tried using calibre to convert to PDF but all fonts were tiny.

Is there any program that I can use to just print the epub properly to physical paper?

Or any simple way to configure Calibre conversion to PDF to work properly?

Here's an example page with a diagram: https://pastebin.com/fcKrBQYd

(sorry if this asked before, it feels like it should but couldn't find anything useful neither here or googling)