If you refer to blank spaces in crafting recipes, they can be achieved. First, in place of blank spaces, put an item that is not a part of the recipe. Second, filter that item out with a hopper (or a hopper minecart). And last, there should now be blank spaces where they're needed.
If you refer to blank spaces in crafting recipes, they can be achieved. First, in place of blank spaces, put an item that is not a part of the recipe. Second, filter that item out with a hopper (or a hopper minecart). And last, there should now be blank spaces where they're needed.