Yup, I know!
[Edit]: To be precise, it HAS some coolant. It just seems to bee too little, about 1/8 of the repository. It works about 6 mins and shutdown, but don’t get the yellow button (cooling down).
A previous machine with a faulty pump didn’t start cutting, which makes sense because, as you said, no coolant = death sentence. I think the pump is failing and that prevented the tube to die.
A cause for an immediate turn around and warranty issue from the first. That is a shipping issue and up to Glowforge to settle. I would have it back in the box ready to be picked up as soon as you had the shipping label. The three month warranty would make the cost to you only annoyance and time.
I ended up transferring the coolant from the old refurbished one to the new refurbished one.
That worked like a charm. Support ticket closed.
AFAIK, we don’t know what’s the secret coolant, is that right?
There was a discussion about unicorn tears, and the specific unicorn was never identified, but there were a few formulae for fake unicorn tears that were used in similar situations by other companies.
Hahaha, Unicorn Tears. You made my day.
The raspberry one would give a nice pinky glow to the glowforge , maybe that is used for the “Barbie Glowforge?”
Apparently a much less tasty and more poisonous variety is involved in the Glowforge. Apparently there are some possible contaminants in normal water or antifreeze that can do weird things in an extreme magnetic field which occurs as a part of how a laser works.
As my understanding is extremely limited in the entire subject that was the best I learned and probably wrong but was an excuse found on the web that did not come from Glowforge but was about CO2 lasers generally.
I believe it was discovered by a former member to be 50/50 distilled water & glycol.
It sounds just right. Water transfers the heat, and the glycol prevents freezing.
I used to put glycol and distilled water at 50:50 in my 12-year-old Laser Cutter. Then, I reduced glycol to only 20%, then I stopped using glycol at all and only distilled water. It worked like a charm during hot, summer days!
Water has better heat transfer than any coolant I know (but it could be some that is better than water, tho). Also, since the fluid goes only through plastic and glass, there is no risk of corrosion.
Not good in freezing temperatures tho, cuz ice would break the CO2 tube!
oh, I just finished reading old posts about the subject and learned I’m not being original by suggesting using distilled water as coolant 
BTW, I had forgotten how cool is the GF when it works as it should!!
Actually not. Water has a weird thing that one side is positive and the other negative so making long chains as a liquid that holds a great deal more energy. Were that not true life would not be possible.
This tells me that you’ve never come across Casa Dragones Añejo Tequila. It not just has polar covalent bonds (like water molecules), but also three-center two-electron bonds and three-center four-electron bonds, which gives you Sight Beyond Sight! 
Not sure how it will perform as coolant, tho!
I’ll just chime in because I’m tired of reading the hundred posts while I was on vacay :-). I was not a crowdfunder… not an engineer and loved the idea of the simplicity of ‘how’ to use it…bought it, had to send it back 2 times for 2 different reasons. Received refurbs both times. First one was a problem, second one was great and has been for 2 years now. I love the GF and have learned a lot from the forum…
Here’s a start I created.
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