You have to change the size for the page and paper, the first has to be the size of the cards while the second is the size of the paper which you use to print all cards.
\definepapersize [card] [width=47.5mm,height=76mm] \definepapersize [sheet] [width=660mm,height=330mm]
\setuppapersize [card][sheet]
\setuplayout [page] [location=middle,marking=on] \setuplayout [page]
\setuppaper[nx=13,ny=4] \setuparranging [XY]
\starttext \showframe \dorecurse{100}{\centerbox{\definedfont[Sans sa 5]\pagenumber}\page} \stoptext
Wolfgang
Thanks Wolfgang, that works. Next question to this: The printable area of the sheet is not the complete area, e.g. it has a not-printable margin of 10mm on the left, 2mm right, and 5mm at the top and 5mm at the bottom. How to control these margins, s.t. the cards are only set in the printable area of the sheet? I tried with "topspace", "buttomspace" etc. in \setuplayout, but that does not work now. Thanks. Huseyin