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I have a long Mathematica notebook where some cells on multiple levels are closed for clarity.

When I export the notebook as a PDF via Print or Save as, the print only contains the opened cells.

I want to be able to print all cells - even the closed ones - into the PDF.
When I open them via Cell -> Grouping -> Open all Subgroups my actual notebook is changed destructively, and I have to re-close certain groups by hand because there's no proper undo.

Did I miss any option?

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Quick an dirty: save your notebook in the desired state, open all cells, print and then revert to the saved notebook? – Yves Klett Jul 1 '14 at 14:36
@YvesKlett Pity, that you didn't put your comment as an answer :) – eldo Jul 1 '14 at 14:55
Thank you for your answer! I hoped there was a much more elegant solution to this - I don't have the feeling that I'm trying to achieve something extravagant here. Hopefully Mathematica 10 will improve this. – Thomas Fankhauser Jul 1 '14 at 17:18

Another quick(?) and dirty way:

Let nb be the notebook to be printed. E.g., execute nb = EvaluationNotebook[] in the notebook you would like. Then execute

NotebookPrint[NotebookGet@nb /. CellGroupData[data_, Closed] :> CellGroupData[data, Open]]


 NotebookGet@nb /. CellGroupData[data_, Closed] :> CellGroupData[data, Open]]

One potential drawback is that NotebookGet essentially creates a copy of the notebook (I assume).

There is probably a way to make it more automatic. Others here are more fluent in manipulating notebooks than I am. I have had this problem, but I cannot find or recall how I dealt with it. Perhaps as Yves suggested in a comment: save the notebook, open all cells, print, and revert to saved.

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