Extrude curved face so I can print it on 3d printer

I would like to 3d print a transition coupling from a square opening to a round opening. I have successfully drawn it but I now need to add depth for the walls. I can extrude the flat sections but not the curved sections. Any suggestions??

Check this plugin: JointPushPull Interactive.

That worked great.
Thanks so much for the help

If you want to try it without a plugin, this would be one possible way…

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