When my roll printer expired, the next one could cope with A2 cut lengthways - effectively giving the size of two A4 sheets end to end. That printer also expired…I know some like to cut their own paper sizes -- for example an A3 sheet cut in half length-wise produces a long sheet which can be printed on an A4 printer. I think 17" is a standard length (legal paper?) available on most A4 printers.
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