Proofgrade™ Material Not Detected


Proofgrade™ materials are the first materials that are sourced, prepared, encoded, and lab-tested for perfect printing, every time. Proofgrade materials are specially formulated for the Glowforge 3D laser printer and work well with other cutter/engravers using CO2 laser technology.

Your Glowforge uses the wide angle camera under the lid to read the QR code that is on each piece of Proofgrade material, and then automatically selects the perfect settings for that material. For example: when you put in a sheet of Blue Acrylic, you’ll see this in the upper left corner of the workspace:


If your Glowforge can’t recognize the material, you’ll see this message:


In order to properly detect the Proofgrade material, the QR code needs to be visible in the printer bed, the lid camera needs to be clean, and the light in the room can’t be so bright as to reflect off of the QR code.

This article shows you how to manually select a material, and gives you troubleshooting steps to ensure your Glowforge can detect the Proofgrade material.

Manually select Proofgrade material

You can manually select your Proofgrade material anytime it is not automatically detected.

Here’s how:

  1. Sign in to
  2. Open your design.
  3. Click Unknown in the upper left corner of the workspace.
  4. In the search bar, type the name of the Proofgrade material you’re using.
  5. Select your Proofgrade material from the list.

QR code is not visible in the workspace

If the QR code for your Proofgrade material is not visible in the photo shown in the Glowforge app workspace, your lid camera will not be able to detect the material to apply the correct settings. Make sure the QR code is visible to the lid camera. 

Here's how: 

  1. Reposition your material inside the printer bed so that the QR code is visible to the lid camera.
  2. Close the lid of your Glowforge
  3. Wait for your printer to take a new photograph and display it in the workspace.
  4. If the QR code doesn’t show in the workspace, move the material again until it does.
  5. If the QR code is visible in the workspace, and the material is still not detected, try the next step.

Lid camera is dusty or has particles 

Sometimes while printing, debris and small particles of material can build up on the lid camera. If the workspace in the app appears blurry or hazy, cleaning the lid camera can help your lid camera properly detect the Proofgrade material. 

To clean your lid camera

  1. Turn off your Glowforge.
  2. Using a Zeiss wipe, gently wipe the lens of the camera on the lid camera. Wipe_lid_camera.png
  3. Place a piece of Proofgrade material in the bed with the QR code facing up.
  4. Close the lid and turn your Glowforge back on.
  5. Open any design in the Glowforge app to test if the material is detected. If the material is still not detected, try the next step.

The Proofgrade material QR Code is reflecting a lot of light

If the overhead lighting above your Glowforge is too bright, this can sometimes cause a reflection on the QR code of the Proofgrade material. This can make it difficult for the lid camera to properly detect the QR Code. 

When this happens, reposition the Proofgrade material in the printer bed to reduce the reflection, or lower the light in the room to reduce any obvious glare. 

Contact us

After trying these steps, if Proofgrade material still isn’t being detected, contact Glowforge Support. Please include a screenshot of what you see in the app. We’ll get back to you with next steps to help resolve the problem. 

Was this article helpful?
0 out of 0 found this helpful