make a page with no sidebars for printing

Add this to your child-theme stylesheet:

@media print {
    #header, #secondary, #tertiary, #footer { display: none; }
}

If you want to keep the header and or footer when the page prints simply remove the #header and/or #footer and the corresponding commas.

Thanks,
I use the code but the left sidebar is still showing up. Is there a way to get rid of that too?

Also, do you know if there is a way for the links in a post to be active when on the front page? You can click on them on the individual post page but not on the home page.

Change your @media query to this.

@media print {
    #header, #secondary, #secondary aside, #tertiary, #footer {
        display: none;
}

The menus work fine for me using Chrome & Firefox.

Perfect, thank you. The printing preview is working without sidebars now.

But on the home page the click here for more information isn’t showing as a link. Only on the individual post page. That seems weird to me.