src/main/resources/assets/mekanism/recipes/plasticblock_12.json

{
  "result": {
    "item": "mekanism:plasticblock",
    "data": 12,
    "count": 4
  },
  "pattern": [
    "SSS",
    "SDS",
    "SSS"
  ],
  "type": "mekanism:ore_shaped",
  "key": {
    "S": {
      "item": "mekanism:polyethene",
      "data": 2
    },
    "D": {
      "ore": "dyeLightBlue",
      "type": "forge:ore_dict"
    }
  }
}