Wonder of wonders, I can print from DE, but each page is surrounded by heaps of white space and (what I assume) are the printer's crop marks (those lines at the corner of each page with the little circles). When I view the eBook on-screen the page looks just fine.
What am I doing wrong? I can barely tolerate the poor quality bit map output, but I didn't think I was also expected to print onto A3 paper and then use a guillotine to trim the pages down to size!.