Made one myself, cost me next to nothing with bits from work, not done much with it yet, but im the same , ive been experimenting with differnt oils, used car oil , vegetable oil etc, etc, the trouble i had was that somtimes the nozzle would keep catching on fire, which was a enoying, ive heard boiled linsead oil is ok , but that is still expensive, im going to make another bottom half with more coils, which i think should create more heat? and see what happens, ill let ya know how i go on, must admit tho it do look impressive when its working correctly, a chain saw noise , and shouting dogs