Find, then learn
An unread blueprint is a physical item. Picking it up does not automatically teach its recipe. Use the existing learning action to consume one plan; duplicate plans remain useful carried goods after that design is known.
Follow a theme
Forge ruins, Ember Vault mastery and world-boss victories can yield cinder expedition designs such as the Ashfall Sabre and Cinderwake Halberd. Buried tombs, Rime Crypt mastery and werewolf-rift victories are sources for rime designs such as the Rimeglass Rapier.
Keep a workshop ready
A learned design still needs its own materials and station. The Ashfall Sabre uses steel, fire crystal and charcoal; the Rimeglass Rapier uses cold iron, ice crystal and quartz. The item identity is fixed by its recipe while workmanship follows the crafter’s skill.
Mechanics reference
Original guide prose, checked against these game source catalogs for 1.53.0 · build 70:
inventory/expedition_blueprint_catalog.dartinventory/heritage_gear_catalog.dart
Actual in-game costs, compatibility and confirmations take precedence if your installed version differs.