Material Recipe is a type of IRecipeManager and implements all the methods that are available to IRecipeManager's, such as removeRecipe() and removeAll().

The following script adds a Material Recipe that allows a Diamond to be used to create Bone (Material) parts in the Part Builder with a material value of 3 and a needed value of 5.

The needed value is how many of the input (in this case Diamonds) are needed to make 1 Material. An example of this being Ingots vs Nuggets. Ingots have a needed value of 1 while Nuggets have a needed value of 9 (since it takes 9 Nuggets to make 1 Ingot).

You can find valid materialIds by running /ct dump ticMaterials in-game.

ZenScript
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// <recipetype:tconstruct:material>.addItem(name as string, ingredient as IIngredient, value as int, needed as int, materialId as string)

<recipetype:tconstruct:material>.addItem("test_material", <item:minecraft:cocoa_beans>, 3, 5, "tconstruct:bone");

The following script removes the Flint (Item) to Flint (Material) parts from the Part builder.

ZenScript
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// <recipetype:tconstruct:material>.removeByName(name as string)

<recipetype:tconstruct:material>.removeByName("tconstruct:tools/materials/flint");