The ME Formation Plane in Applied Energistics 2 (AE2) is one of the most powerful tools for in-world automation, yet it remains one of the most misunderstood components in the mod. Many players approach it with the expectation that it functions like an ME Export Bus—thinking they can simply open a GUI, select an item, and have the network "push" that item out.

In reality, the Formation Plane functions as a passive storage destination. It does not pull items from your network. Instead, it waits for the network to "store" an item into it. If you want to export items directly into a Formation Plane, you must change your perspective from "exporting" to "prioritizing storage."

The Quick Solution for Direct Exporting

To effectively "export" items to a Formation Plane, you have two primary methods depending on the complexity of your setup:

  1. The Priority Method: Set the Formation Plane’s storage priority (found via the Wrench icon in its GUI) to a very high number (e.g., 1000). Use an ME Export Bus or an ME Interface pointing elsewhere in the network to "insert" items into the system. The network will automatically choose the Formation Plane as the first place to "store" that item, causing it to be placed in the world instantly.
  2. The Subnet Method (Recommended): Create a dedicated sub-network. Place an ME Interface on the subnet and point an ME Export Bus from your main network into that Interface. Connect the Formation Plane to the subnet. Because the subnet only has one storage destination (the plane), any item pushed into the subnet Interface will immediately be placed by the Formation Plane.

Understanding the Formation Plane Logic: Storage vs. Export

To master the Formation Plane, you must understand the fundamental AE2 distinction between Active Devices and Passive Storage.

Active Devices (The Pushers)

Devices like the ME Export Bus, ME Import Bus, and ME Interface (when configured to stock items) are active. They actively scan the network or connected inventories and move items. They "consume" items from storage or "push" items into storage.

Passive Storage (The Sinks)

The ME Formation Plane is a "Storage" device, specifically an insert-only storage bus. It behaves exactly like an ME Storage Bus attached to a chest, with one key difference: instead of putting the item into an inventory, it puts the item into the physical world.

When an item enters the ME Network (via an Import Bus, a Terminal, or a Pattern Provider), the network looks for the best place to put it. It checks all available storage cells and storage buses, starting with the one that has the highest Priority value. If the Formation Plane has the highest priority and accepts that item type, the network "stores" it there, and the plane places it as a block or drops it as an entity.

Detailed Guide: The Priority Method

If you are working on a small, dedicated network—such as a specialized ore processing line—the Priority Method is the easiest to implement.

Step 1: Physical Placement

Attach the Formation Plane to your ME Cable. Ensure it is facing the direction where you want the block to appear or the item to drop. Like most AE2 cable sub-parts, it requires one channel.

Step 2: Accessing the GUI

Right-click the center of the Formation Plane. You will see a few slots for filtering and a Wrench icon in the top-right corner.

Step 3: Setting High Priority

Click the Wrench icon. This opens the Priority settings. Set this to a high positive integer (e.g., 100, 1000). Most ME Drives and Storage Buses default to 0. By setting this to 1000, you are telling the network: "Before you put this item in a high-tech 64k Storage Cell, try putting it here first."

Step 4: Filtering

If you don't set a filter, the plane will try to place anything that enters the network. This is usually dangerous, as random items might end up cluttering your world. Drag the specific block (e.g., Cobblestone) into the filter slots.

Step 5: Triggering the "Export"

Now, use an ME Export Bus on a different part of the network (perhaps pointing into a trash can or a chest) or simply drop the item into an ME Interface. When the item enters the network, the "High Priority" rule kicks in, and the item bypasses your drives and goes straight to the Formation Plane.

Detailed Guide: The Subnet Method

While the Priority Method works, it can be "leaky." If your main network is busy, sometimes items might slip into regular storage cells if the Formation Plane is temporarily blocked or if there is a millisecond of power fluctuation. Professional AE2 builders use Subnets (isolated networks) to ensure 100% reliability.

The Architecture of an Export Subnet

A subnet for a Formation Plane consists of:

  • An ME Interface (on the Subnet).
  • A power source (usually via a Quartz Fiber or an ME Toggle Bus from the main network).
  • The Formation Plane itself.

Implementation Steps

  1. Isolate the Subnet: Run a short length of ME Cable that is not directly connected to your main network's controller.
  2. Provide Power: Use a Quartz Fiber to connect your main network cable to the subnet cable. Quartz Fibers transmit power but not data/channels. This keeps the networks separate while sharing your base's energy.
  3. The Interface "Bridge": Place an ME Interface on the subnet cable.
  4. The Main Network Push: On your Main Network, place an ME Export Bus pointing directly into the face of the subnet's ME Interface.
  5. Configure the Export Bus: In the Main Network's Export Bus, tell it which items you want to place (e.g., Seeds, Obsidian, or Pure Daisy ingredients).
  6. Subnet Priority: Inside the subnet, set the Formation Plane to Priority 1. Since there are no storage cells on the subnet, the Interface has no choice but to "push" the items it receives into the only available storage: the Formation Plane.

In my experience, this is the "gold standard" for automation. During a recent build involving a 128-channel GregTech factory, using subnets for Formation Planes reduced the CPU load on my main controller and prevented my bulk storage from being accidentally filled with thousands of unwanted blocks.

Advanced Configuration and Upgrades

The Formation Plane is more versatile than a simple block-placer. Using upgrades can significantly change its behavior.

Block Mode vs. Item Mode

In the GUI, there is a toggle switch.

  • Place Block: The plane will attempt to place the item as a block in the world. If there is already a block in that space, it will fail (and the item will go to the next available storage in your network, or stay stuck in the bus).
  • Drop Item: The plane will eject the item as a floating entity (like a player pressing 'Q'). This is essential for setups involving the Botania Endoflame or the Draconic Evolution Fusion Crafting.

Using Capacity Cards

By default, the Formation Plane has a limited number of filter slots. If you are building a complex multi-block or a decorative wall with various materials, insert Capacity Cards. This expands the filter list, allowing one plane to handle dozens of different block types.

The Fuzzy Card

When automating blocks that have NBT data or durability (like different types of wood or damaged blocks), the Fuzzy Card is your best friend. It allows the plane to ignore specific metadata. For example, if you want it to place any type of "Stone" regardless of its variant, a Fuzzy Card set to "Ignore All" will ensure smooth operation.

The Inverter Card

If you want the Formation Plane to place everything except a few specific items, use the Inverter Card. This turns the whitelist into a blacklist. This is particularly useful for "Garbage Disposal" systems where you want to dump everything onto a lava pit except for your valuable tools.

Real-World Automation Scenarios

1. Botania Pure Daisy Automation

One of the most common uses for a Formation Plane is automating Livingwood and Livingrock.

  • Setup: Surround a Pure Daisy with 8 Formation Planes (on a subnet).
  • Logic: Use an ME Export Bus on the main network to push Stone/Logs into the subnet Interface.
  • Result: The planes instantly place the blocks around the flower. Combined with an ME Annihilation Plane (to break the blocks once they transform), you have a fully automated, silent system.

2. Automatic Seed Re-planting

If you are using a mechanical harvester that doesn't automatically replant, place a Formation Plane facing down over the farmland.

  • Setup: Set the plane to a subnet and filter it for the specific seed.
  • Logic: Connect the output of your harvester (via an Import Bus) to your network. Set the priority of the Formation Plane high.
  • Result: The moment a seed is harvested and enters the network, it is instantly teleported back to the Formation Plane and replanted.

3. Obsidian Generators

Generating obsidian often involves placing lava and then water. By using a Formation Plane (filtered for Lava Buckets) and a fluid-handling setup, you can precisely place lava blocks into a controlled chamber. Note that for fluids, you can right-click the filter slot with a bucket to set the fluid type.

Troubleshooting Common Issues

Even with the correct priority, things can go wrong. Here is a checklist based on common pitfalls I have encountered in various modpacks:

1. "Fake Player" Permissions

Many servers and modpacks include chunk-claiming mods like FTB Chunks or WorldGuard. These mods protect your base from griefing. Because the Formation Plane is a "machine" trying to place a block, the server treats it as a Fake Player.

  • Fix: Go into your chunk claim settings and "Allow Fake Players" or specifically add "[Applied Energistics 2]" to your trusted list. If you don't do this, the plane will simply do nothing, even if powered and configured correctly.

2. The Item Goes into a Storage Cell Instead

If your item is being stored in your ME Drive instead of being placed:

  • Check the Priority. Is it higher than the ME Drive?
  • Check the Filter. Is the item correctly whitelisted?
  • Check for Obstructions. Is there already a block in front of the Formation Plane? It cannot place a block if the space is occupied.

3. Channel Exhaustion

The Formation Plane is a "Cable Sub-part," meaning it requires 1 Channel. If your cable is glowing red or the plane says "Device Missing Channel," you have exceeded the 8-channel limit of a basic cable or the 32-channel limit of a Dense Cable.

  • Fix: Check your P2P tunnels or add an ME Controller if you haven't already.

4. Power Spikes

Placing blocks rapidly (e.g., in a high-speed cobblestone generator) consumes a small amount of AE power per operation. If your network's internal buffer is low, the network might flicker.

  • Fix: Add an ME Energy Cell (or a Vibrant Energy Cell) to your network to act as a battery buffer.

Summary of Best Practices

To ensure your AE2 Formation Plane works as a direct export device:

  • Always favor Subnets over Priority for complex builds. It prevents "leakage" and keeps your main network clean.
  • Use Quartz Fibers to power subnets without merging their channel logic.
  • Remember that the plane is Passive Storage. Something else (Export Bus, Interface, or Import Bus) must move the item into the network for the plane to react.
  • Toggle between Block and Item mode depending on whether you need a physical block or a floating entity.

By mastering the "Storage-First" logic of AE2, you turn the Formation Plane from a frustrating, non-responsive block into the centerpiece of your automation empire. Whether you are building massive structures or automating magical flowers, the key is knowing that the network doesn't push—it stores.

FAQ

Can I use a Formation Plane to place fluids?

Yes. AE2 supports fluid formation. You need to configure the plane for fluids and ensure your network has a way to "store" the fluid into the plane (e.g., via an ME Fluid Export Bus or an ME Fluid Interface).

Does the Formation Plane work with microblocks or slabs?

Generally, yes. It will attempt to place the block as it would if a player right-clicked. However, specific placement logic (like the orientation of a piston or the top/bottom half of a slab) is usually determined by the direction the plane is facing.

Why is my Formation Plane dropping items as entities instead of placing them?

Check the GUI. There is a small icon that toggles between a "Block" icon and an "Item" icon. If it's set to the Item icon, it will always drop the item as a physical entity on the ground, even if it's a placeable block like Dirt.

Do I need a Crafting CPU for the Formation Plane?

Only if you are trying to "Craft" the item specifically to be placed. For example, if you want the system to craft a block of TNT and then place it, you would use an Export Bus (with a Crafting Card) pointing into a subnet Interface. The Crafting CPU handles the job, and the Formation Plane handles the placement.

How many items can a single Formation Plane place at once?

The speed is limited by the rate at which items enter the network. If you are importing items with multiple Stack Upgrades, the Formation Plane can place blocks almost as fast as the game ticks allow. For maximum speed, use a dedicated subnet with multiple interfaces receiving items simultaneously.