Yeah, I’m not a big fan of running my lasers from 10pm until 2am when I still have a 9-5 the next day. 
But! Your initial link helped us figure out that if we raised the unit off the table with 2x4s, it did allow more of the vented cool air to flow under the unit towards the sensor (Why is it under the unit?? lol Heat rises!) and we were able to run until about 10am this morning. So, thank you!
I’m hoping when the air filters finally get shipped that it’ll provide cooling in that area of the unit without risers, but I guess we’ll see.
Yeah, see, if it had started the cut, I would have just let it do its thing. It didn’t even start, despite unplugging, relocating, filling full of cool air, etc.
Again, there was no starting, only cooling. That was kind of the whole problem I was encountering, which is why this started in the Problems & Troubleshooting section.
Having run commercial production units for decades as well as hobby units, I will disagree with you. There are a lot of features my commercial units managed better, and I still plan on getting a commercial unit later, but Glowforges are leaps and bounds better than any China made unit or hobby laser I have used previously. My only current complaints are about not being able to save my own settings, not being able to easily cut multiples of a single design or arrange them cleanly, the lack of a pause button, and the lack of a rotary. Oh, and, well, I guess not being able to turn off the heat sensor, but our work arounds fixed that.