The M601 can enlarge to any size you want, as Paul says just rotate the head pin the paper to a wall or a board. I've done a life size cut out of a person that way.
The other option is bench or wall mount the enlarger and have an adjustable bench. I had a piece that I could slot in a different heights and regularly did 20x24" and larger prints. I a had an M601 (later an M670) and a Johnsons V45 side by side for quite a few years using this method, it's very practical.
Ian
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