Ebay Stirling Cryocoolers

[CatalinaWOW]

It varies by region, for but LN2 is pretty cheap to buy.  Cheaper than gasoline.  Unless you have continuous use it buying LN2 is a far more economical way to go than to set up to produce it.

That said, the nerd coolness factor of making your own is over the top.

[CM800]

It varies by region, for but LN2 is pretty cheap to buy.  Cheaper than gasoline.  Unless you have continuous use it buying LN2 is a far more economical way to go than to set up to produce it.

That said, the nerd coolness factor of making your own is over the top.

I agree on the latter!

The main reason is that I only really want to use it periodically. I'm mostly interested in actually making the unit, mostly just messing around.