Saving a forum thread as a PDF can be challenging due to the rendering of equations via JavaScript, which many PDF converters cannot handle. Users have reported mixed success with various PDF printer utilities, with some being able to capture equations but only on the first page. In Firefox on MacOS, users can save a single-page thread directly as a PDF, while multi-page threads require saving each page separately and combining them later. Tools like BullZIP, CutePDF, and PDFForge have been mentioned, along with the built-in "Save As PDF" feature in Opera for Windows. Overall, while there are methods to save threads, issues with LaTeX and multi-page documents persist.