@Daniel, thanks, I did keep a backup but I’ll take a look at that file instead
the printer does support SRA3 (even bigger, if Dorico could do occasional fan-fold (e.g. 3) pages it would be awesome, some page turns are impossible), so if the layout is set also to SRA3 then there’s no scaling involved. I want to avoid scaling, as scaling up reduces the usable space on the page as everything’s bigger, and scaling down makes it harder to read. With no scaling, the staff size is as per configuration. It seems to actually be working this way, as in the print panel in Dorico, it’s showing SRA3 with no scaling.
Yes, I used to always print to PDF and use Acrobat reader (desktop version) to control printing booklets. Always need pdfs anyway for publishers etc, although not sure if they like SRA3 layouts …
I find SRA3 works great on a music stand, 20mm wider and 25mm taller than normal A3 once it’s folded into a booklet. Paper stock can be a mission to find though, but I’ve been through all that now.