StructSaver

StructSaver is a Fabric mod for Minecraft 1.21.5 that allows you to save, manage and place structures directly in-game.

Whether you're building cities, redstone contraptions or decorative builds, StructSaver provides an easy way to create reusable structure templates with visual placement previews.

Features

Selection

• Select areas using a wooden hoe
• Two-click corner selection
• Optional single-block selection mode
• Colored selection outlines (8 presets)
• Multiplayer synchronization
• Ghost-block preview of selected structures

Structure Library

• Save structures with custom names
• JSON-based storage format
• Searchable structure library
• Creation date display
• Rename structures
• Delete structures with confirmation dialog
• Overwrite warning for existing structures

Placement

• Real-time ghost preview
• Green preview = valid placement
• Red preview = blocked placement
• Placement centered on the targeted block
• Rotation support
• Mirroring support
• Easy right-click placement

NBT Support

• Export structures as Minecraft .nbt files
• Import existing .nbt structures
• Share structures between worlds and computers

Settings

• Open settings with F6
• Toggle area and single-block selection
• Change selection outline colors
• Mod Menu integration

Multiplayer Support

StructSaver is designed to work in multiplayer.

• Server-side structure storage
• Client-side rendering
• Network synchronization for save, load, rename, delete, preview and placement

Requirements

• Minecraft 1.21.5
• Fabric Loader
• Fabric API
• Java 25

Controls

Key	Action
R	Rotate clockwise
T	Rotate counter-clockwise
F	Mirror X-axis
G	Mirror Z-axis
F6	Open settings

Notes

• Placement is restricted to Creative and Spectator mode.
• Supports Minecraft's standard NBT structure format.