RetroRig: Builder
by kyden_
RetroRig: Builder recreates the early BuildCraft Builder and Filler machines for NeoForge, powered by FE energy and driven by saved blueprints.
What it does
Both machines take materials and FE power from automation, show holographic previews before any work starts, and keep their place through chunk unloads, reloads and normal world saves.
Blueprints are captured directly from the world: two corners mark the area, the blocks inside are saved, and the result is kept as a Blueprint item that can be named for easier sorting later. Rotation and offset controls apply to both machines, so a build can be previewed rotated or shifted before placement begins.
RetroRig: Builder is part of the RetroRig mod suite and is built on NeoForge for 1.21.1 and 26.1.2. Only the server and players who join it need the mod, since both sides must run it. It is released under All rights reserved and is not open source.
Key features
Blueprint capture
Two marked corners save the blocks inside an area into a Blueprint item, which can be named for later sorting.
Builder machine
The Builder places a saved structure, with rotation and offset applied, once it is loaded with materials and power.
Filler machine
The Filler generates its own shape from a chosen mode and size, then fills, erases or replaces everything inside it.
Holographic previews
Both machines render a preview of the work before it starts, so placement can be lined up in advance.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who want automated construction in the style of the early BuildCraft machines, and server owners who want shared build machines in a modern NeoForge setup.
How it compares
Buildcraft-Legacy is a NeoForge mod under the Mozilla Public License 2.0, open source and published for 1.21.1 only, with the same client and server environment. BuildCraft UNOFFICIAL covers 1.21.1 – 26.2 on NeoForge under the same license, also open source. Scaffolding Blueprint is open source under the GNU General Public License v3.0 only and runs on Fabric and NeoForge for 1.21.1, with the client and server environment. RetroRig: Builder differs by being closed, under All rights reserved, and by focusing on the BuildCraft Builder and Filler machines.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| RetroRig: Builder | NeoForge | 1.21.1 – 26.1.2 | Client and server | 2026-06-24 |
| Buildcraft-Legacy | NeoForge | 1.21.1 | Client and server | 2025-11-09 |
| BuildCraft UNOFFICIAL | NeoForge | 1.21.1 – 26.2 | Client and server | 2026-07-15 |
| Scaffolding Blueprint | Fabric and NeoForge | 1.21.1 | Client and server | 2026-06-19 |
Questions
Does RetroRig: Builder need to be installed on the server?
Which game versions does RetroRig: Builder support?
Does the Builder need power and materials to work?
In the catalog
RetroRig: Builder is one of 8,499 Technology mods on ModsFinder, and one of 3,557 Technology mods for NeoForge. 15,189 mods support Minecraft 26.1.2.
More from kyden_
Similar mods
What the author says
FormForge is a standalone mod built around a simple idea: bring back the feel of the old BuildCraft Builder and Filler, but in a modern setup. (Part of the RetroRig mod suite) It also adds a Blueprint item for capturing structures directly in the world.
Official listing
- Modrinth page
- modrinth.com/mod/retrorig-builder
- Owner
- kyden_
- Published
- 2026-03-30
- Updated on Modrinth
- 2026-06-24
- Facts verified
- 2026-10-15