[Koha] Simplest way to print labels?

I'm about to leave the Koha project I've been volunteering on, and I need to find a better way of printing labels… What I have been doing is CSV export, then importing into LibreOffice (OpenOffice), and then formatting the sheet of labels every single time. But it's too much work — the person who replaces me will never want to do that. The problem is that we automatically split our call numbers into 3 lines, so the margins are not the standard ones. Does anyone know a simpler way of exporting labels into a template or file that is pre-formatted in terms of fonts and margins? I am not against using Word or some other commercial software. Thanks, Peter