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Just want to say that I still have an almost full tank of CO2 lasing gas mixture and a regulator and other misc stuff if anyone is interested. I hear helium is very scarce these days so this gas will be hard to source (it has some helium in the mixture).

Did you find gas for it? I had quite a heck of a time finding it myself. I have a tank, almost full, and regulator if you are interested.

I've ordered probably 15 times and had no problems. You get what you pay for I guess.

So far just manual control. I was thinking of using Arduino. I'm still trying to think of some clever and cheap DIY scanner, using speaker drivers. I have them laying all over the place at work.

No, no sarcasm. Here is mine: https://www.banggood.com/RGB-300mW-White-Laser-Dot-Module-Red-Green-Blue-638nm-520nm-450nm-TTL-Driver-Modulation-p-1252293.html?rmmds=search&cur_warehouse=CN

Oh, SNAP! I thought it was one of the many floating ads! Due, you really went whole hog.

Which RGB module are you using?

First light (at least for THIS owner of the tube) for a CO2 laser!

Vids of a CO2 laser I have been working on. Tube and NST (and advice) kindly donated by Anthony P.

Yipee Cayay!!

Misc Stuff

Yes, I have seen that done on YouTube, using a balloon and calipers or something to measure diameter and calculate volume. I probably will try that but just thought this would be simpler to start. Does the pressure in the resonator change as the balloon deflates? You didn't mention N2? Is...

SOLVED I found a supplier. SCI Analytical (http://scicalgas.com/). They will mix whatever you need and ship it. Prices seem reasonable, and they are very hobbiest-friendly. I'm going to start with a known good mixture and get everything else working, then maybe experiment with my own mixes.

I may try that, it is hard to find a blend from these industrial sources, if you don't own a business

If the CO2 levels in the air go up enough, maybe I can use it for my CO2 laser! (and aim it at Anthony)

I found this on Alibaba: https://www.alibaba.com/product-detail/Laser-and-electric-light-source-mixed_60832442256.html?spm=a2700.7724838.2017115.169.66a442a7M899yF

I wonder if I just procured the individual gasses, and went into a welding or neon sign shop and asked then to blend it for me...?

Thanks for responding. As I said, I'm talking about a blend of gasses. They don't sell CO2 laser blends at a party store (unless parties have gotten a lot more "rad" since I was young! I have searched on Amazon, Ebay, Alibaba, various commercial companies (mostly they don't respond or want...