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Assembler (Autocrafter) Recipe Registration

The Assembler supports dynamic recipe registration using ScriptEvents.

It already supports all vanilla crafting table recipes automatically.
If you are using a custom crafting table, you must register its recipes manually using the format below.

Sending the ScriptEvent​

import { system, world } from "@minecraft/server";

const newRecipes = {
  "iron_ingot,iron_ingot,iron_ingot,air,redstone,air,iron_ingot,iron_ingot,iron_ingot": {
    output: "utilitycraft:machine_case",
    amount: 1
  }
};

world.afterEvents.worldLoad.subscribe(() => {
  system.sendScriptEvent(
    "utilitycraft:register_crafter_recipe",
    JSON.stringify(newRecipes)
  );
});

Recipe Key Format​

The key represents the 3×3 crafting grid, ordered:

  • Left → Right\
  • Top → Bottom

Use "air" for empty slots.

Example:

iron_ingot,iron_ingot,iron_ingot,air,redstone,air,iron_ingot,iron_ingot,iron_ingot

The pattern must contain exactly 9 comma-separated entries.

Recipe Object Fields​

  • output (required)
    Resulting item identifier.

  • amount (optional, default: 1)
    Number of items produced.

  • leftover (optional)
    Array of items returned after crafting.
    Example: ["minecraft:bucket"]

Example Recipe Object​

const recipes = {
  "bucket,iron_ingot,bucket,iron_ingot,blast_furnace,iron_ingot,bucket,iron_ingot,bucket": {
    output: "utilitycraft:molten_core",
    amount: 1,
    leftover: ["minecraft:bucket"]
  }
};

Notes​

  • New recipes are added automatically.
  • Existing recipes are replaced if the pattern matches.
  • Invalid patterns (not 9 slots) are ignored.
  • Vanilla crafting recipes do not need registration.