Just for reference: The mod Super Old Blueprint String can import these old strings.FuryoftheStars wrote: ↑Sun Jun 19, 2022 3:54 am[...]I think what caused me to believe this was [...] the fact that I didn't realize it didn't natively exist in game before 0.15 [...], and then not too long ago I came across a thread with a "blueprint string" from 0.13 that made no mention of needing a mod to use and someone else posting saying the game was giving them a message about failing to import.
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Author of: Factorio Blueprint Decoder