What is Smeltery IO?
If you have ever spent hours babysitting a Tinkers Construct smeltery, waiting for metals to melt or manually pouring each cast, Smeltery IO is the addon that will change your workflow. This mod picks up where the familiar Tinker I/O left off, offering a fresh take on smeltery fuel management and casting automation. It introduces a handful of clever blocks that integrate directly with the smeltery controller, letting you control heat, automate casting, and feed items in from any direction. The result is a cleaner, faster, and far less tedious smelting experience.
Smeltery IO does not reinvent the wheel; instead it refines it. The mod requires solid fuel in the form of snowballs to power its casting machine, a twist that encourages you to build a snow farm or pair it with something like the Upsizer Mod. While liquid fuel is still needed to keep the smeltery running, the new fuel controller can push temperatures much higher using solid fuel, unlocking faster processing speeds. The entire system is designed to scale with upgrades, redstone control, and clever inventory handling.
Key Features of Smeltery IO
- Fuel Controller that accepts solid fuel to boost smeltery heat beyond liquid fuel limits.
- Casting Machine powered by snowballs, automating ingot and block casting.
- Smeltery Input block that pulls items from any item transport into the controller.
- Upgrade system for speed, capacity, and mode switching.
- Redstone signal compatibility for precise on/off control.
- Automation support that locks cast and upgrade slots until the tank empties.
Getting Started with the Fuel Controller
The Fuel Controller is the heart of the thermal system. Place it adjacent to your smeltery controller and feed it a solid fuel source — coal, charcoal, blaze rods, or any burnable item. While the smeltery still demands a lava tank or other liquid fuel to function, the Fuel Controller cranks the internal temperature significantly higher. This means metals melt faster and alloys form in a fraction of the usual time. You can stack Speed Upgrades inside the block to adjust the fuel-to-heat ratio, making it incredibly efficient once you have a steady fuel supply.
One of the biggest advantages is how the Fuel Controller plays with other mods. If you already have an automated tree farm or a wither skeleton spawner, you can pipe fuel directly into the controller. For those who want a hassle-free setup, the foxygame.net launcher offers a streamlined experience, allowing you to browse and install Smeltery IO directly from its built-in mod menu, along with any dependencies you might need. This makes it simple to test the Fuel Controller alongside your favorite tech mods without digging through file folders.
Automating Casting with the Casting Machine
The Casting Machine is where Smeltery IO really shines. Attach it to a smeltery drain and supply it with snowballs — yes, snowballs — and it will automatically pour molten metal into casts or basins. By default it handles basic ingot and block casting, but you can install a Basin Upgrade to toggle between casting table and basin modes. Speed Upgrades accelerate the pour, while a redstone signal can pause the machine entirely, giving you full control over when output happens.
Automation enthusiasts will appreciate the locked cast and upgrade slots. When you unlock these slots via the machine’s interface, external pipes or hoppers can extract finished casts and upgrades only when the internal tank is empty and the machine is idle. This prevents items from being pulled mid-cycle and breaking your production line. Combine it with a simple snowball generator — a snow golem trapped near a block breaker — and you have a fully autonomous casting setup that never needs your attention.
The Smeltery Input Block
Feeding a smeltery manually is a chore, especially when you are processing dozens of ore blocks. The Smeltery Input block solves this by acting as a universal item acceptor. Place it against the smeltery controller, and any item transport system — hoppers, buildcraft pipes, conveyor belts, or even quark pipes — can push items directly into the smeltery’s inventory. The block automatically distributes items to valid slots, so ores go into the smeltery, fuel goes into the controller, and everything else gets routed correctly.
This block is essential for large-scale automation. Pair it with a storage drawer array and a filtered item conduit, and you can dump all your ores into a single chest, letting the system sort and smelt everything on its own. Because the Smeltery Input respects the smeltery’s capacity, it will not overflow or waste items, making it safe to leave running indefinitely.
Compatibility and Modpack Integration
Smeltery IO is designed to slot neatly into existing modpacks. The mod author encourages its use in any pack, and there is even an official TiCh Immersion Modpack that showcases the full potential of Tinkers Construct addons. Note that version 1.3 and above are not backward compatible with 1.2 saves due to TileEntity registration fixes, so if you are updating an existing world, be sure to check your version. The official MCT Discord server is the best place to get help, share builds, and find community-made configurations.
To get the most out of Smeltery IO, consider adding a mod that simplifies snowball production, like a snow block compressor or the Upsizer Mod mentioned by the developer. A mod that provides easy solid fuel, such as a tree farm or a coal generator, will also keep the Fuel Controller running nonstop. Since the blocks interact through standard item and fluid transfer, they work with virtually any tech mod, from Thermal Expansion to Create.
Conclusion
Smeltery IO takes the familiar Tinkers Construct smeltery and turns it into a high-speed, fully automated production line. The Fuel Controller pushes temperatures to new heights, the Casting Machine eliminates manual pouring forever, and the Smeltery Input ties everything together with hands-free item insertion. With a small snowball farm and a steady fuel source, you can forget about smeltery micromanagement and focus on building bigger and better factories. Whether you are playing a lightweight vanilla-plus pack or a sprawling tech modpack, Smeltery IO earns its place as a must-have quality-of-life upgrade.
--- **Update Sep 2, 2026:** Added 2 files for version 1.12.2 (Forge).