I got decent results doing the following:
1. opened the txt file in Wordpad and resaved as RTF.
2. select all text and change font to Lucida Console and 12 pt.
3. printed as PDF using PrimoPDF (
http://primopdf.com), a printer driver that generates PDFs, on "Letter" sized output with zero margins.
even so, it does read much better in landscape mode.
BTW, the Author and Title fields PrimoPDF creates (optional) don't display properly on my K3