Yes it seems to be a buffering problem
in file printerproperties.py
I changed the line
         with tempfile.NamedTemporaryFile(mode='wt') as tmpfile:
to
        with tempfile.NamedTemporaryFile(mode='wt',buffering=1) as tmpfile:
and now the command file sending works for me.

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https://bugs.launchpad.net/bugs/1500636

Title:
  commands passed to cups fail. File missing

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