Originally posted on tf2.wiki.net
Crafting is an in-game system allowing players to create specific items, such as a weapon, hat or materials for further crafting, using unwanted or duplicate items gained normally via the Item drop system. To create these items, the player must follow explicit blueprints, some of which are initially available and others of which must be discovered by the player by experimentation. After following a valid, undiscovered blueprint recipe, the player will both gain the item specified by the blueprint, and the blueprint will be added to the player's list of known blueprints. If the player attempts to craft an item without a corresponding blueprint, they will be notified that no such recipe exists, and no items will be lost.
