Cooldowns and Air Assist Issue

I think the air assists in my machine are having issues despite being cleaned.
Let me repeat that for the people who will comment assuming I didn’t clean my fans or lens.
I cleaned all 3 air assist fans, lens, mirror, etc before I started my 1 hr job
All of my pieces engraved perfectly. Half of them cut just fine, the other half didn’t cut at all.

Another issue I noticed, while cutting or attempting to cut, my machine is having to cooldown after just cutting 3 or 4 pieces that are only 2.6" in size. The ambient temp is 65 degrees. Normally at this temp or sometimes even warmer, I can cut several pieces without a cooldown. I only see a cooldown period when the temps rise to above 80 degrees.
Since I had just cleaned all my fans, lens, mirror, etc, what else could be causing these issues?

Also, one more thing since I’m on here… the cable that connects to my laser head is occasionally unclipping while running long jobs. I have blown it out with air and I always check to make sure it’s connected properly, but it will still come undone at times.
Could a bad connection with the cable also be the problem behind all of the other issues at the moment?

Glowforge has a sensor that measures fan speed and another that measures temperature, both running through that white cable. Even an intermittent or high resistance point through that connection would give the results you are seeing, and might even create a real fan speed problem.

If that can happen it is not connecting properly. I would look carefully and post close-up photos to see if the clips that are supposed to hold it in place are not worn or otherwise not working properly. I almost never unclip mine for that reason as it lowers the chance of such a problem. Though I do have to be more careful cleaning lenses,


I started to unclip mine to clean it because my magnetic lens remover broke. Each one I have ordered from GF has arrived broken as well, so it’s easier to clean it by taking the head off.
Please I cut mainly acrylic and have to clean the fan below the carriage quite often, which means removing the laser head.

@MorningstarMSI I am so sorry your Glowforge printer is cooling down and getting an air assist alert.

Your Glowforge features a closed-loop liquid cooling system that uses the air from the room to remove heat. It is designed to be used when the temperature next to your Glowforge is between 60 degrees Fahrenheit (16 Celsius) and 75 degrees Fahrenheit (24 Celsius). To check, put a room thermometer next to the right hand side of the Glowforge; it draws in air from underneath, on the right.

You can try any of these things to improve warm-weather performance:

  • Try printing with no material on the bed (so as not to generate smoke and fumes) and no exhaust hose attached. If this works, then the problem may be that your exhaust hose is constricting the flow of air out of the unit, preventing cooling.

  • Examine the bottom-right side of your Glowforge, and ensure that there is no fabric or other flexible material underneath it, like a tablecloth. There are air intake vents, and if they become obstructed, it makes cooling less effective.

  • Try pointing a fan at the right side of your Glowforge. If there is warm air around the intake, this could help it cool off.

  • Power off your Glowforge when you are not using it. When your Glowforge sits idle, the fans are off, so heat can build up

  • Just wait. Your print may take a little longer when it’s warm, but your Glowforge will protect itself and make sure it cools enough to prevent any loss of power or damage. It’s clever enough to pick up from exactly where it left off, even if it needs to pause to cool down during the print!

  • Ensure that the sun isn’t shining on the lid. This could cause the inside of your Glowforge to heat up.

  • If you are venting outdoors, ensure that extreme temperatures or humidity do not enter the Glowforge unit through the exhaust hose. Disconnect the hose from the outside air when the Glowforge is not in use.

  • Turn your Glowforge off and open the lid for a few minutes before trying again. It’s possible for the air in your Glowforge to heat up, just like a car in the sun on a hot day, opening the lid will help that warm air to escape and your Glowforge to cool down.

If you are still running into trouble, please let us know the following so that we can investigate further:

  1. A description of the things you tried and what happened

  2. If possible, place a thermometer next to your Glowforge on the right hand side and measure the temperature there; if not, estimate the room temperature

  3. The date and time (including time zone) when you had the problem

  4. Take a picture of the exhaust hose behind your Glowforge that includes the part where it connects to your Glowforge, and the part where it exits the room

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