Structure Void Filler - Helper Addon for Minecraft Structures

Requires both "Beta APIs" and "Upcoming Creator Features" experimental toggles to be enabled!

Setup

Using an anvil, rename your items:

Right-click (or long-press) the Void Settings stick to open the configuration menu:

Fill Operations:

Size Options:

Preset Sizes: Small (6×4×6), Medium (12×6×12), Large (20×10×20), Massive (32×12×32)
Custom Size: Fine-tune X, Y, Z dimensions (up to 64×32×64)

Placement Modes:

Centered (Grounded): Builds from the middle or bottom of the block you target
Directional Fill: Expands from the corner in a specific direction (North, South, East, West)

Placement Offset:

Adjust X, Y, Z offset for precise positioning (works with all fill modes, not just paste!)

Block Selection:

Fill Block: Choose from Stone, Dirt, Air, Water, Lava, Glass, Oak Planks, or Cobblestone
Outline Block: Glass, Barrier, Structure Void, Light Block, or Chain
Walls Block: Stone Bricks, Deepslate Bricks, Blackstone Bricks, Oak Planks, or Cobblestone

Advanced Options:

Hollow Fill: Creates a hollow shell (only outer blocks, empty interior) for fill mode
Visual Preview: Shows placement with stone blocks before final conversion
Preview Lifetime: Set how long preview lasts (1-30 seconds)
Preview Expiration: Choose whether preview converts to structure void or air
Grounded: (Centered mode only) Build from bottom up or around center
Notifications: Toggle completion messages
Clear Non-Ground: Remove non-ground blocks (converts to air)

Throw the Void Filler snowball at your target block to execute the operation instantly!

Hold Sneak + Throw Snowball to cycle through operation modes:

Normal → Copy → Paste → Paste X-Flip → Paste XZ-Flip → Paste Z-Flip → Fill → Outline → Walls → (back to Normal)

Chat will display the new mode and selected block type.

Feature	Description
Enable preview	Shows blocks in stone before converting them - great for checking placement!
Set direction	Controls which way the region expands from the hit block
Use custom size	Fine-tune exact dimensions for your fill area
Placement offset	Position fills precisely without moving - works with all modes!
Hollow toggle	Create hollow boxes for fill mode - perfect for building rooms
Copy & Mirror	Duplicate structures and flip them along X or Z axes
Multiple modes	Switch between void filling, solid filling, outlines, and walls on the fly
Use air fill	Converts structure_void blocks back to air for cleanup
Throw snowball again	Executes another operation with current settings

Unified Placement Offset: All fill modes (fill, walls, outline) now respect placement offset sliders for consistent positioning
Visual Preview for All: Preview mode now works with fill, outline, and walls - not just normal void filling
Hollow Fill Mode: Create hollow structures with just the outer shell, separate from walls mode
Enhanced Block Palettes: More block options for each mode type(now with text box to choose any block)