Hey everyone,
Because there wasn't an up-to-date tool to mirror blueprints in Satisfactory 1.2—especially when using Infinite Nudge to rotate walls, ramps, and pillars onto non-standard axes—I decided to try building one myself with the help of AI to save dozens of hours on my own megastructure build. Since it ended up working so well, I wanted to share it with the community!
I have zero programming knowledge. In the past, I used to skip tools like this because I thought they were too technical and gave up before even trying. Over just a few hours of back-and-forth troubleshooting with Google Gemini, I learned everything from scratch: I brought my 3ds Max understanding of 3D pivots and tested every iteration live in-game, while Gemini wrote and calibrated the Node.js script based on my screenshots. If you've ever felt intimidated by code or GitHub, don't be—I put together a super simple step-by-step guide so anyone can download it, double-click a shortcut, and mirror blueprints in seconds.
The attached screenshots show the original modules with their mirrored halves already generated by the tool and snapped together in-game!
Download & Full Step-by-Step Setup Guide on GitHub:
https://github.com/XtriX1/-Satisfactory-1.2-Architectural-Blueprint-Mirror/blob/main/README.md
Note: Tested using the Megaprinters mod (for the 48m tall test modules shown in the screenshots), but the tool works identically with vanilla Blueprint Designers (Mk.1–Mk.3). Regardless of which direction your Blueprint Designer faces on the map, standing in front of its control panel always defines Left ↔ Right as the X-axis and Front ↔ Back as the Y-axis.
What Was Tested & Calibrated (Shown in Screenshots):
Foundations & Ramps: Standard, Concrete, Frame Foundations, Glass Frame Foundations, Inverted Frame Ramps.
Walls & Windows: Standard Walls, Tilted Walls, Hexagonal & Single Windows (including 90° sideways/flat Infinite Nudge rotations).
Ramp Walls & Inverted Ramp Walls: All sizes (1m, 2m, 4m, 8m) across all materials.
Quarter Pipes & Inverted Quarter Pipes.
Painted & Steel Beams (angled/crossed structural trusses).
Signs & Small Billboards (including ceiling-mounted light panels).
Catwalks & Walkways (including Catwalk Corners, Ramps, T-Junctions, Intersections, and Railings).
Asymmetric Left & Right Assets.
Limitations & How Easy It Is to Fix Untested Pieces:
Architectural Use Only: Do NOT use this on conveyor belts, pipes, power cables, or production machines, as those contain directional logic that hasn't been tested.
Untested Niche Pieces: Only the architectural pieces listed above have been tested so far. Other niche pieces (such as specific roof corners, train signals, or hypertube supports) might rotate the wrong way on your first try.
Easy AI Fix (No Coding Needed): If an untested piece rotates the wrong way, you don't need to know internal asset names, math, or code to fix it! Just start a chat with Google Gemini, upload or paste your mirror.js file just once at the start along with a screenshot of the misaligned piece, and explain what looks wrong in-game. From there, you just keep calibrating it back-and-forth in that same conversation with new screenshots until it fits—that's literally how I did it!
Hope this saves other megastructure builders dozens of hours—and encourages more players not to give up before trying!