Aligning Engravings on the GlowForge Aura with a 3D-Printed Corner Guide

Part 1: The Problem

About 6 months ago, I got a GlowForge Aura. It was my first laser engraver/cutter, but I had CNC experience with a Genmitsu 4040-Pro Max and assumed that knowledge would transfer.

It was not quite what I expcted though. I should have researched GlowForge more before buying.

It’s a good device, and I use it primarily for engraving. For cutting, I rely on the CNC or its larger 10w laser attachment.

My biggest frustrations with the GlowForge Aura were twofold. First, their software uses a Software-as-a-Service model and is cloud-hosted. The free version works fine for me, so the subscription fee isn’t an issue, but the threat of GlowForge going out of business and bricking a $1,000 machine isn’t appealing.

Second, instead of a coordinate system, the GlowForge workflow relies on camera alignment. It’s a clever concept and useful in its own way, but it lacks precision.

Part 2: The Fix

To fix this, I designed a 3D printed guide that aligns workpieces on the work table, giving you the ability to use exact coordinates for your projects. This one minor change has shifted my GlowForge experience from frustration to something that fits seamlessly into my regular workflow.

Here is the model file and calibration tool for anyone interested:

Installing the Guide

Place the guide onto the honeycomb grid of the GlowForge Aura in the top left corner. This becomes your origin point.

The guide should fit snugly into the honeycomb with no movement.

When placing the honeycomb back into the tray, make sure it sits securely. The Aura’s tray is slightly larger than the metal honeycomb itself, so position it snugly in the top left corner of the holder tray.

Calibration and Use

The download includes a calibration tool in both SVG and Adobe Illustrator format.

After installing the tool, upload the SVG file to the GlowForge application. Leave it in the default top-left corner position. Set the job to cut or engrave only the red square, and set everything else to ignore.

Place a piece of material (at least 70 mm x 70 mm) against the top left corner of your installed guide.

Once the engraving or cut finishes, use calipers to measure from the guide’s edge to the square’s edge. You’re aiming for around 10 mm. In this example, the measurement is 9.3 mm on the left side and 13.2 mm on the top.

Now for some simple math.

The red square in the SVG sits at X = 20 mm, Y = 20 mm.

That means you’d expect the actual measurements to be 10 mm on the left and 10 mm on the top since the guide is 10 mm wide. In this example, the actual measurements are 9.3 mm and 13.2 mm.

Note, you are not measuring the square itself here. You are measuring the distance from the guide’s inside corner to the engraved square. Since the test square should land 10 mm from the guide on both axes, any difference between 10 mm and your measured value is your correction offset.

The left side measured 9.3 mm, meaning the design landed 0.7 mm too far left, so X needs a +0.7 mm correction. The top measured 13.2 mm, meaning the design landed 3.2 mm too low, so Y needs a -3.2 mm correction.

We can verify this by engraving/cutting the calibration test again. This time, if we did everything correctly, we should measure exactly 10 mm on the left 10 mm and 10 mm on the top.

My actual result measured about 10.07 mm and 10.07 mm, so roughly ±0.1 mm accuracy.

Once you’ve verified everything is correct, you now know the origin point of the guide’s corner.

In our example, it would be:

So the origin of the corner of the guide = (10.7 mm, 6.8 mm)

With that figured out, you can place coordinate designs against that corner and align them consistently each time.

Once calibrated, the printed guide gives you a repeatable physical reference point. Instead of trusting the camera preview, you can place your workpiece against the guide and position your artwork using known coordinates.

Part 3: Possible Next Steps

The design could be tweaked depending on how consistent all Glowforge Aura machines are. It’s conceivable the design could be adjusted to work without calibration. Since I only have access to one machine, though, I can’t be sure.

I could potentially tweak my design to account for the offset and simplify it further. For now, though, adding a small position change to a part works fine.

If you end up using the design, let me know in the comments what offsets you find. If they’re about the same as mine, I can update this to include a global adjustment and dial the design in further.