DESCRIPTION FOR 1.21

Jumbo Furnace is a neoforge mod that adds the Jumbo Furnace. The Jumbo Furnace can be created by placing 27 furnace blocks in a 3x3x3 cube. You can itemize the jumbo furnace by using shears on it or baking 27 furnaces in a jumbo furnace.

The Jumbo Furnace has a larger inventory than a regular furnace. The Jumbo Furnace can smelt standard vanilla furnace recipes, as well as its own "jumbo smelting" recipes (more on those later). The jumbo furnace, when upgraded, is also capable of processing multiple recipes simultaneously. For this reason, recipes are processed asynchronously from each other, and ingredients are consumed when the recipe begins processing rather than when the recipe finishes. Items which were accidentally dropped into a Jumbo Furnace and consumed can be retrieved by breaking the furnace before they are fully smelted.

The jumbo furnace can be upgraded to process more than one recipe simultaneously by adding more jumbo furnaces to the jumbo furnace's upgrade slot; each recipe being processed consumes fuel independently, so the total amount of fuel consumed will be proportional to the total number of recipes processed. The `jumbofurnace:multiprocessing_upgrade` item tag controls which items count as upgrades.

The Jumbo Furnace is fully compatible with hoppers and other item handlers; the top faces access the input inventory, the side faces access the fuel inventory, and the bottom faces access the output inventory.

The jumbo furnace supports custom "jumbo smelting" recipes, which can have up to nine ingredients and nine results. Example recipe json:

{
	"type": "jumbofurnace:jumbo_smelting",
	"ingredients":
	[
		// ingredients are neoforge "sized ingredients" and may be any vanilla or custom ingredient type and may optionally include a count
		{
			"tag": "minecraft:anvil",
			"count": 4
		}
	],
	"results": [
		// results are vanilla-format itemstack objects and may optionally have "count" or "components"
		{"id": "gold_ingot"},
		{"id": "iron_ingot"},
		{"id": "copper_ingot"},
		{"id": "diamond"}
	],
	// cookingtime and experience are optional and default to 200 and 0, respectively
	"cookingtime": 200,
	"experience": 0.1
}

DESCRIPTION FOR 1.20.1

Jumbo Furnace is a forge mod that adds the Jumbo Furnace. The Jumbo Furnace can be created by placing 27 furnace blocks in a 3x3x3 cube. You can itemize the jumbo furnace by using shears on it or baking 27 furnaces in a jumbo furnace.

The Jumbo Furnace has a larger inventory than a regular furnace. Because the Jumbo Furnace can smelt multiple recipes at a time, it has a fixed cooking cycle time for all jumbo smelting recipes (specified in your world folder's serverconfig/jumbofurnace-server.toml file). Vanilla smelting recipes with higher cooking times than jumbo furnace's cycle time cannot be smelted in the jumbo furnace.

The Jumbo Furnace supports recipes that require up to nine ingredients. The Jumbo Furnace supports the standard ingredient types added by Minecraft and by Forge, and should generally work with json ingredient types added by other mods. These recipes can be defined in json by using the "jumbofurnace:jumbo_smelting" recipe type. An example of a recipe that the Jumbo Furnace supports (but does not add):

{
	"type": "jumbofurnace:jumbo_smelting",
	"ingredients":
	[
		{
			"tag": "minecraft:fishes,
		},
		{
			"tag": "minecraft:fishes"
		},
		{
			"tag": "minecraft:fishes",
		},
		{
			"type": "forge:nbt",
			"item": "minecraft:redstone",
			"count": 5
		}
	],
	"result":
	{
		"item": "minecraft:slime_ball",
		"count": 3
	},
	"experience": 0.35
}

If you want to make a recipe that uses the jumbo furnace -- but only if the Jumbo Furnace mod is present -- you can use's forge's Conditional Recipes as below:

As of version 2.0.1.0, Jumbo Furnace supports a "jumbofurnace:tag_stack" ingredient type that can specify a tag and a stack size, allowing for recipes that use numerous items from a given tag. Example:

The jumbo furnace can be upgraded to smelt more than one recipe per cooking cycle by adding more jumbo furnaces to the jumbo furnace's upgrade slot; this consumes fuel proportional to how many recipes are being smelted simultaneously. The `jumbofurnace:multiprocessing_upgrade` item tag controls which items count as upgrades.