mikejd - what system are you printing from (windows, Debian, Ubuntu)? what version of Qcad, what printing system (e.g. cups)?
I've found that printing to ps or PDF works fine so long as I set a non-zero line width to avoid incredibly faint lines. Using a PDF printer has produced the most useful results. (apt-get install cups-pdf on a debian-based system).
You do need to set the paper size in 'Current drawing preferences' first.