Precast Structure
by Boomber
Pre-cast Structure lets players build a structure once, then carry a copy of its blueprint and place it again wherever another build is needed.
What it does
Players scan the interior of a finished build to create a blueprint. The blueprint is fed into a Structure Printer, which prints the required materials and produces a portable Pre-cast Structure item. Holding the item shows a hologram preview, and a copy can be placed where it is needed without rebuilding the structure by hand.
The mod is aimed at repetitive building projects in creative and survival worlds. It adds a frame volume with platform floors, perimeter fencing and scaffold height, so the outline of a build can be laid out before the blocks go in. A fallback rendering mode keeps the preview working on systems where the default renderer is unavailable.
Installation needs Architectury API and Cloth Config API on both Fabric and NeoForge. Create, Fabric API and Sable are optional. Pre-cast Structure is client and server, so both the server and every player need it, and it is released under the MIT License as open source for 1.21.1, with the latest builds dated 2026-08-04.
Key features
Blueprint scanning
The interior of a finished build is scanned into a blueprint that can be reused later.
Structure Printer
A printer turns a blueprint into the materials it needs and a portable Pre-cast Structure item.
Hologram preview
Holding the portable item shows a hologram of the structure at the spot where it would be placed.
Frame and scaffold layout
A frame volume with platform floors, perimeter fencing and scaffold height lays out a build before placement.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
Optional 3
Use cases
Who it’s for: Players who build repetitive structures, and server owners who want a shared way to place prefabricated builds on 1.21.1 with Fabric or NeoForge.
How it compares
Create: Building Dimension is a NeoForge-only, open source mod for 1.21.1 under the MIT License that also runs on client and server, but it is a separate building dimension rather than a blueprint system. Create Aeronautics: Sable Mass Mod Compatibility covers Fabric and NeoForge for 1.21 – 1.21.1 under the GNU General Public License v3.0 only, and it is server required with client optional, so it has a different install footprint.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Precast Structure | Fabric and NeoForge | 1.21.1 | Client and server | 2026-08-04 |
| Create: Building Dimension | NeoForge | 1.21.1 | Client and server | 2026-08-13 |
| Create Aeronautics: Sable Mass Mod Compatibility | Fabric and NeoForge | 1.21 – 1.21.1 | Server required, client optional | 2026-06-02 |
Questions
Does Pre-cast Structure need Create?
Which loaders does Pre-cast Structure support?
Does the server need Pre-cast Structure?
In the catalog
Precast Structure is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
Pre-cast Structure lets you build once, then reuse that work anywhere. Frame a volume with platform floors, perimeter fencing, and a scaffold for height. Scan the interior into a Blueprint, feed it into a Structure Printer with the required materials, and print a portable Pre-cast Structure item. Hold it for a…
Official listing
- Modrinth page
- modrinth.com/mod/precast-structure
- Owner
- Boomber
- Published
- 2026-08-02
- Updated on Modrinth
- 2026-08-04
- Facts verified
- 2026-10-15