My laser tube seemed to change to totally red and I’m concerned that this may cause problems with my machine. Is it due for a replacement? I saw that it’s $500 but I have to ship my machine back to glowforge. Is there any way I can just buy the tube and replace it myself or is this hard to do on our own?
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Nope. Totally normal. With time and use they turn red or orange. Keep using it until it fails.
(Mine’s been pink/red for a couple years.)
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I am a new owner, and I just mentioned to my husband last night the tube is no longer clear. 
I was concerned.
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Thank you!
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Looks normal to me for high power continuous cutting. At low power you won’t be able to see any color.
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@chie_obligar Thanks for sharing the picture, that does look normal. I’m going to close this ticket, but please reach out if you have any other concerns or questions.