PrettyPipes/src/main/resources/data/prettypipes/recipes/medium_filter_module.json

{
    "type": "minecraft:crafting_shaped",
    "pattern": [
        " B ",
        "IMI",
        " B "
    ],
    "key": {
        "I": {
            "item": "minecraft:iron_ingot"
        },
        "M": {
            "item": "prettypipes:low_filter_module"
        },
        "B": {
            "item": "minecraft:iron_bars"
        }
    },
    "result": {
        "item": "prettypipes:medium_filter_module"
    }
}