Multiples of a specific item stack the item's effects in a particular manner, instead of each affecting the player individually. There is no limit to how many different types of passive item, or how many of a passive item a player can hold at any one time. by using a 3D printer), they no longer are affected by that item's effects. If it is removed from their inventory ( e.g. A passive item visually appears in the top bar in-game and provides a certain benefit to a player (or in some cases, a drawback), specific to that item, as long as it is in a player's inventory.
