Looking for advice on Rolls of Sub Paper, We currently use an Epson ET-15000 printer which accepts A3+ paper, but need to print slightly longer items. Does anybody make 12" wide rolls?

The closest i've found is True Pix 13" rolls, which are sold at 330mm wide, has anybody used this with an A3+ printer? on spec the printer says it will accept 329mm width and I've found that printing A3+ at this width is tight in the rear feed, wondering if the extra 1mm would actually make a difference in use.