I just noticed TID 3786843 which recommends hotfixes for Windows SP
Workstation:

Novell recommends that every Windows 2000 SP4 and XP SP2
workstation running the iPrint client have two Microsoft
hotfixes applied....
1) Install Microsoft hotfix KB 884897 - Missing print features
2) Install the Microsoft hotfix KB 893225 - Slow print performance

I have noticed that "n-up" printing does not seem to work with iPrint.

Has anyone done this with good/bad results? It appears that you have to
beg Microsoft support for access to these, as I can find the discussion
of them on the Microsoft web pages, but not the download itself.

Tom