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:
- Stick →
Void Settings - Snowball →
Void Filler
How to Use
1. Configure Settings
Right-click (or long-press) the Void Settings stick to open the configuration menu:
Fill Operations:
- Normal Fill Mode: Fill with structure void or convert structure void to air
- Fill Mode: Place any block type in your selected region (solid or hollow)
- Outline Mode: Draw edges using non-solid blocks like glass or barriers
- Walls Mode: Build vertical perimeter walls
- Copy/Paste: Duplicate structures with optional X/Z axis mirroring
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)
2. Aim and Target
- Point at the block where you want the operation to start
- Directional mode: This block becomes the starting corner
- Centered mode: This block becomes the center (or bottom-center if grounded)
3. Execute
Throw the Void Filler snowball at your target block to execute the operation instantly!
4. Cycle Modes
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.
Quick Tips
| 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 |
New Features Highlights
- 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)

