Probably because the printer Firefox was set to had A4 as the default.
Apparently not.
I repeated as follows:
in SH3D Page setup (Ctrl+Shift+P) -
in SH3D Print (Ctrl+P) I
Then, prior to opening the file in Firefox, I set the Firefox destination printer as "CutePDF Writer" and paper size to "ISO A0" - when opened the wall still appeared across multiple pages.
It therefore seems key (in Windows 10 at least) that A0 is selected in the first SH3D Page setup step.
Assuming the PDF printer didn't scale a little while creating the PDF because of margins this should be correct. But I suspect a little scaling was done to fit within the margins. The same for the physical printer, it most likely can't print to the paper edge so a minimum margin is needed. It will be close though.
Appreciate this Keet - printing in SH3D no longer seems like a problem
