The Ministry used to have an A0 colour inkjet printer for maps. When I started work there it was being used about once every 18 months or so, which was just the right length of time for the print heads to gunk up and need servicing/replacing. We decided that it would be far more cost effective to outsource our large-scale printing to somewhere that doesn't have to service their printer once per print.
A0 printers don't use sheets of paper, but are fed with a roll 92cm wide (actually a bit bigger than the smaller dimension of an A0 sheet.) You print your print, then you slice it off. When the Ministry decommissioned the its A0 printer, I scored the spare roll of printer paper. Woot for public-service perqs! Originally I thought to use it for pattern-drafting but it makes for good, if narrow, backdrops as well.