I was trying to do the same thing as the original poster. I have a large custom sized document - in my case 36"W x 13"H. I usually like to just make a pdf of it. But I also occasionally print it to our plotter, for which I have the latest drivers installed.
I am able to successfully print oversized documents from other non-office based applications on my MAC. So, it seems to be an excel based problem.
When I am trying to make a PDF, my MAC doesn't ever give me the opportunity to specify a page size, so I have to rely on the page size supplied by Excel, which apparently does not allow the user to make a custom size?
If I want to print to the plotter, I can indeed make a custom size page in the print dialog for the plotter. What ends up printing is multiple 36x13 pages, each with a portion of the whole document in the upper left-hand corner as if I were tile printing,
and planning on taping them together after printing.
Any solution for that in the MAC environment?
Works like a charm when I save as a pdf from my windows computer in Excel 2016. In Windows, I can specify my 36x13 page size. If I specify the page size in Windows Excel, save the file, and reopen it in MAC Excel, my page selection from the previous save
is gone, and I am back to the same problem, with the limited page size options.