Comgrow Z1 Connecting and Cutting Issues (Lightburn)

LightBurn Software Questions
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23

You are on Win11 and I don’t know if that is a selection item or not.

If it brings up a file, and you can open it, then the port is likely working. So we have to work with NoDing.

Launch Lightburn, connect the laser, and see if you are offered COM6 in the (choose) box.

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Still here…

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Jess, if you do not have anything to report, we can continue tomorrow.

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No Ding could be as simple as Sound disabled/muted or Volume level down

1 Like
27

In LaserGRBL you tried to connect to COM5. In the next screenshot you show the device manager listing the laser on COM6. Did you make sure that you selected the correct one?

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Or earphones plugged in.

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The issue is that your laser is connected, but LightBurn is communicating at the wrong baud rate, which is why you’re seeing random symbols in the Console.

Here’s how to fix it:

  1. Go to Devices in LightBurn.
  2. Select your laser and click Edit.
  3. Set the baud rate to 115200 (this is the most common for GRBL).
  • If that doesn’t work, try 921600 or 57600.
  1. Click OK and restart LightBurn.
  2. Power cycle your laser (turn it off and on).
  3. Back in LightBurn, go to Devices > Find My Laser and let it scan.
  • If it finds your device, let it auto-create it.
  • If not, manually create it again, but test each COM port one by one.

Also double-check:

  • In Edit > Device Settings, make sure the G-code flavor is set to GRBL.
  • Make sure “Enable Z axis” is turned off unless you’re using a Z-axis motor.

If you’re still getting gibberish after all that, try swapping your USB cable—some low-quality cables cause interference and corrupt data.

Once the right port and baud rate are set, you should see a clean GRBL version number (like Grbl 1.1f) in the Console instead of random symbols.