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In NieR: Automata, some upgrade materials can be quite elusive. While many are obtained by defeating enemies, others, like Filler Metal, are found in the overworld through random spawns. This means that acquiring these items involves a degree of randomness, making the process somewhat unpredictable.
Filler Metal is a crucial upgrade material that you'll need to seek out in the overworld early in the game, though be prepared for an extensive search. Later on, you can purchase it, albeit at a high price, which might be a more straightforward option if you have sufficient funds.
Where To Find Filler Metal In NieR: Automata
Filler Metal can be discovered at item spawn locations deep within the Factory. The exact spots vary with each visit, and Filler Metal has a lower spawn rate compared to other items you'll encounter. After progressing through the main story and revisiting the factory, you can unlock the Factory: Hanger access point, which serves as an optimal starting point for your search due to its deeper location within the facility.
Depending on your progress in the story, you may need to unlock the Factory: Hanger access point again. While speed boosts can help streamline your search, there's no guaranteed method to farm Filler Metal consistently. Your best approach is to thoroughly explore the factory, picking up all naturally spawned items. However, purchasing Filler Metal may be the most efficient way to acquire it in larger quantities.
Where To Buy Filler Metal In NieR: Automata
The only vendor for Filler Metal is the Shopkeeper Machine at the Amusement Park, but it becomes available only after achieving one of the final game endings, which requires completing all three playthroughs. Once you've beaten the game, you can revisit this Shopkeeper via Chapter Select to access its updated inventory, where Filler Metal is sold for 11,250 G each.
Although the price is high, buying Filler Metal is a more reliable method than repeatedly scouring the Factory. The Pod upgrades requiring Filler Metal are essential for progressing through the game, especially as you face increasingly powerful enemies.