If you print a Todo buffer using one of the standard Emacs printing commands, it does not look exactly like what you see in the buffer. This is because some of the display features are non-printable (specifically, those using overlays, word-wrap and wrap-prefix). Todo mode provides two print commands that produce output which includes printable counterparts of such display features:
Send the printable buffer output directly to your printer.
Prompt for a file name and write the printable output to that file.
By default, Todo uses ps-print-buffer-with-faces to make the
printable version; you can change this by setting the option
todo-print-function.