(unless you are talking about the 'first' save) it should be simply
[menusave( | [s pd-mypatch.pd]
I've never found a way of saving the patch to the current file, but if you
want to save it to a new file, you can do this:
Did not how 'savetofile' worked until you mentioned it! Thanks!! I think this should do it:
[savetofile mypatch.pd /path/to/file( | [s pd-mypatch.pd]