A superior digital rulebook allows you to extract only your Legion. Print just the 6 pages for the Raven Guard. Print just the Wargear section. Better yet, a "rules compendium" PDF that sorts units by unit type (Infantry, Vehicle, Monster) rather than by Legion allegiance is vastly superior for list-building.
While primarily a 40k resource, community-driven archives like the Horus Heresy Lexicanum and Russian archival sites sometimes host "rules summaries" that are reformatted legally. These allow you to copy-paste rules into a clean Word doc, then export to PDF. This is the closest you can get to a without breaking the law. horus heresy 20 rules pdf better