[AmityvilleHams]

Not really.A good example of this being bad would be metal bottle holders sold by many pet stores,which can cause serious injury.Metal is just best avoided,and instead you could use other safe and truly digestible materials that also won't cause injury such as safe untreated or kiln dried wood or certain seagrass items.You can use appropriately sized mesh(aka hardware cloth or chicken wire,but you must get the right kind and this means never using the coated sort!)when building DIY cages or when metal is used for bottle spouts,but other than that metal is just best avoided.