A while ago I had asked if anyone ever made liquid nitrogen from scratch without using a prepackaged cooling device (cryocooler). Well, I've done it. I'm working on a web tutorial and better video footage. For those who wish to make suggestions on what you would like to see I am submitting these links. I will try to accommodate requests since I am still working on it. I can reach -320F in a little over an hour from ambient pressure. I still have to calculate my production rate. Here is the tutorial which is still in development: http://homemadeliquidnitrogen.com Here is one of the videos after a 1:15 hour run I use a homemade PSA for my nitrogen source, which is limitless. The tutorial will give all the parts and sources for making the generator in your own garage.