What the inspector checks
- The string itself. Strings are often cut short when copied from a forum or chat. A damaged string is caught before you try it in game.
- Game version. Strings store the version they were made in. Builds from Factorio 1.1 still import into 2.0, but the game converts them, so they are worth a check after placing.
- Space Age, quality and mods. It lists exactly which buildings or recipes need the expansion, which quality levels are used, and any building that only exists with mods or in the map editor.
- Overlapping buildings. Two buildings on the same tile usually means the string was edited by hand or made with mods; one of them will not be placed.
- Books. For a blueprint book, every blueprint inside can be previewed on its own.
How to get a blueprint string
In Factorio, open the blueprint library with B, right-click a blueprint or book and choose Export string, then copy it. To import a checked string, see how to import a blueprint.
Looking for ready-made builds instead? Browse all blueprints, every one already checked against the game's data.