Tried to print the following PDF file:

$ pdfinfo ~/form01.pdf
Author:         [redacted]
Creator:        Draw
Producer:       OpenOffice.org 3.3
CreationDate:   Sun Nov 25 21:25:17 2012
ModDate:        Wed Nov 28 14:29:31 2012
Tagged:         no
Form:           none
Pages:          1
Encrypted:      no
Page size:      595 x 842 pts (A4)
Page rot:       0
File size:      490843 bytes
Optimized:      yes
PDF version:    1.4

via CUPS into "Canon imageRunner C2550 Foomatic/pxlcolor" which is physically capable of printing to A3. I set the File -> Print -> Properties -> Page size in Okular to A3 and the page indeed was printed on an A3-sized paper, but the actual printed size was just an A4-sized region in the middle of the paper.

So I took the original PDF, run `gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sPAPERSIZE=a3 -dFIXEDMEDIA -dPDFFitPage -sOutputFile=form03.pdf form01.pdf` and the resulting PDF file covers the whole A3 page now.

I would expect that the output shall be either scaled by default, or that there shall be a GUI for making a choice between "print in actual size" and "upscale".

Reproducible: Always