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Stuff is a concept in RimWorld's code by which a material can be chosen before creation of an item or building, used in the item's construction and the stats of the chosen material affect the stats of the end product.
An item that can do this is called "stuffable". Examples of stuffable things include walls, armchairs, longswords and plate armor.
Stuff is usually categorized. For example, an item can be made of "Leathery" stuff, i.e. that part of the recipe can be fill by the correct amount of any given Leather. Some recipes give you a choice, for example beds' stuff is tagged "Metallic, Wood, Stony", allowing the player to choose between those. There are often better/worse choices, especially given the practical availability of different material for different colonies, but also different "stuff" can have differing effects on the final product (e.g. "wood" is more flammable than stone, and "stony" beds are not as comfortable as wood or steel, except for jade). Such details are available in articles for specific items.
- 0.7.581 - Stuff system added. Prior to this, objects equivalent to stuffed objects had to be distinctly defined i.e. wood wall and metal wall.