krastorio.recipes.removeIngredient("kr-matter-plant", "fu_materials_KFK")
krastorio.recipes.addIngredient("kr-matter-plant", { "fu_materials_KFK", 12 })
krastorio.recipes.removeIngredient("kr-matter-assembler", "fu_materials_KFK")
krastorio.recipes.addIngredient("kr-matter-assembler", { "fu_materials_KFK", 8 })
It's removing/changing the amount of KFK for two recipes.