envelope prints sideways

i’ trying to print out some self addressed envelopes i’m using and old printer. hp3180 all in one

What is the problem? A mechanical issue with an envelope not travelling correctly through the printer? Text not printer at the right location?

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In the Print dialog, set Landscape.

If you are using Insert > Envelope..., then in the dialog click on tab Printer and check you have the correct orientation and placement of the envelope for your printer. The pictures are pretty self-explanatory.