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Knife Blade Cast is an item added by Tinkers' Construct.
In order to craft a Knife Blade Cast, 288mB of Molten Gold or Molten Aluminum Brass is needed in a Smeltery along with any Knife Blades crafted from a Part Builder. Place the Knife Blade on the Casting Table then pour the 288mB of Molten Gold or Molten Aluminum Brass in order to form a Knife Blade Cast around the Knife Blade.