Thanks both for your replies.
Leonmallet - yes, I guess it is a bit of a "how long is a piece of string" question. I wonder if anyone who has done this could provide an example. Or even an estimate for, say, 10 x 28mm figures or a 28mm Sherman tank at a good print quality. I am just trying to get an impression whether going down this route might be worthwhile, or whether I should just leave STL files for those who own their own printer.
Robh: That is a good point, and (depending on cost) may push this proposal into the "not worth the effort" box.