Not great news on the operating temp. Front

Well, warmed the camper up to 95°. Got everything in place and fired up the :glowforge:. Unfortunately, all I get is the orange/yelowish button and a message from the web page that they’ll resume the print when things cool down. I see no evidence that a pump and or fan are running to work toward that goal other tha the normal low fan sound that you always hear when its sitting idle. I’ve let the environment cool slowly. Shutting it off and then back on a few times but still nothing. Temp is now down to 87. Not sure how long I’m willing to continue this…:thinking:
I have some really exciting video of the temp dropping, the glowy button and the :glowforge: sitting idle if you’d like to see it


95? Talk about taking one for the team!

Basic or pro?

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Pro, it may be able to operate longer in “warm temps” but as of now, it won’t start in them.

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We’re finally making the move to get central air installed next week. I guess I’ll be hanging on to our portable room-style air conditioner for the rare day that the garage would be too warm for the GF.

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I’ve got it running now. Between 84°and 83° it started to calibrate.


Handy to know! Thanks for testing! :grinning:

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95F = 35C.
That is higher than what i would expect a Pro to be able to handle, though it is an average summer day in my part of Oz.

87F = 30C is about what i would expect the Pro to be able to handle, if not slightly more. That is a surprise

84F = 28C is an achievable temperature indoors (without aircon) for Oz but certainly less than what i expected considering how much the cooling function was talked up

Excellent effort, great test, thank you so much for doing this.


I have to figure out what I will do for the next Summer…
It’s 5:53PM here in SoCal and we’re still at 101 F, It’s a dry heat though… :stuck_out_tongue_winking_eye:
I plan to set up my :glowforge: in my garage workshop, so no AC, it’s probably about 85 F in there right now. I’m trying to find out if those portable AC units will work, and also figure out if I can put in on a different circuit than the :glowforge: or our fridge, don’t want to pop a breaker every 5 minutes. Our garage faces West straight on, which means you can sometimes fry an egg on that garage door.



LOL, i cannot put it in our garage, as that is, literally, where we have our sauna!


I’m pretty sure if I would put a box of rocks, a bucket of water and a ladle in the middle of my garage, that I could get a sauna going… :stuck_out_tongue_winking_eye:


Have you thought about garage door insulation? The humidity in Georgia nixes the idea of putting our 'forge in the garage, but for general messy projects, it sure would be nice to be a tad cooler! Just putting dark auto window tint on the row of windows made a pretty noticable temp difference, btw. I told my mother we had a sauna for her, you just had to go up the pull-down stairs to get into the garage attic :sunglasses: Even smells like one!


This happened to me and my room was 86 F. I emailed support and got this response
"Your Glowforge Pro features a solid-state thermoelectric cooler that allows for heavier use at higher ambient temperatures than the Basic. It is designed to print in an operating environment between 60 degrees Fahrenheit (16 Celsius) and 81 degrees Fahrenheit (27 Celsius). Printing outside these ranges may cause your print to pause periodically or fail to complete."

I went out and bought a large fan that I placed over my Pro. After a while I got the temp under 81 and it has been working fine ever since.


Interesting, because when i asked in another thread (Pro Heat Limits) i was told by Dan they did not have solid limits yet

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So the difference in temperature between the Pro & Basic is:

Pro = 27C max (81F)
Basic = 24C max (75F)
this is from Glowforge User Manual V2.1.4

Not sure that 3C (6F) is a big enough difference to warrant buying the Pro for its cooling capability.


Really makes me love living in Venice. We’re probably 15 miles apart and a 25+ degree difference. (crazy humid out there so it still feels nasty)

Yeah the SFV is always 10-15F hotter than you guys, but I do prefer the dry heat. I lived in Cincinnati for a while, there it could be 55 F and really humid, and it was miserable! You would have a jacket on, and because of the humidity feel hot/sweaty and as soon you would unzip your jacket you would feel cold. So it was very uncomfortable…

It’s not so much (imo) about the max temp in which it can operate as about what happens with pauses as you get near or at max temp. We don’t have field data about that, but if you’re trying to keep your coolant at or below 75F while pumping 75F air through the heat sink, that sounds like it could have a lot of pauses to get the coolant back down to operating temperature. So for long heavy jobs the effective max temp for the basic could be lower, while the pro, more overall capacity for pumping heat out of the machine, would just keep zapping along.

(I’m sure GF has internal models and tests that make this very specific, and I also expect that their liability people are unlikely to release those because someone will figure out an underspecified edge case.)


That reply was July 30 and I don’t remember the limits being published when I got my pre email on Aug 2. A week or two later they came up with those pro temp limits quoted above.

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Frankly my expectation for what a Peltier cooler can do is quite low, so I’m not surprised. But I start pausing at around 74°F, which is why the basement is air conditioned, so it was not a concern I had.

At work we had a FSL and to use it you had to fill (and empty) a bucket of water with an aquarium pump in it. Spills and leaks were inevitable, and on a long job the water would get warm and the power would fade. No warning, no pause, just ruin your job. And presumably hurt the tube. So as far as I’m concerned, having it take care of itself as long as the room is reasonably cool is just magic.


So what you’re saying, is you had to size the water bucket to the length of the job :grin: