src/main/resources/assets/mekanism/models/block/nothing.json

{
    "elements": [
        {
            "__comment": "nothing",
            "from": [0, 0, 0],
            "to": [0, 0, 0],
            "faces": {
                "down":  {},
                "up":    {},
                "north": {},
                "south": {},
                "west":  {},
                "east":  {}
            }
        }
    ]
}