[gentoo-user] {OT} Printing text with lpr

[Grant]

I have a Brother QL-570 label printer printing on 29x90mm labels.  My
goal is to have 6 characters printed across the center of the label.
It prints like this:

$ echo 123456 | lpr

but the text is in the upper corner of the label, it has the wrong
orientation, and the font is too small.

It also prints like this:

$ lpr test.png

but the text doesn't come out very crisp, and I'd rather not create a
file with imagemagick for each label to print.  Is there another way
to print large, properly oriented text on the fly?

- Grant