Well I finished construction on my new vacuum chamber. The one I have been using is actually my friends and I was getting tired of moving it around all the time. I picked up a vacuum pump from harbor freight with one of those 20% off coupons. It is a 3 CFM, two stage, oil pump. Here is a picture of the specs.

The chamber is made from a section of 6" CPVC pipe that I had left over from another project. I cut it to 6.5" in length and then turned the ends smooth on a lathe. It functions just the same as the larger one I was borrowing, but pulls a vacuum a little faster because there is less volume inside. I am only vacuum degassing about 250 ml at a time, so the other chamber had a bunch of empty space.

If you want more details on building a vacuum degassing chamber, or just a vacuum chamber in general. I created a separate project for this on hackaday.io.

Vacuum Chamber Build Log