Greg the little moisture trap that comes w/ the Hypertherm 1250 (on the back of the machine) is OK if you have VERY dry air to start with. It is more like eyecandy in my opinion. I woud mount your TP type filter close to the plasma unit if you have a long run of piping to get there like I have. If the compressor is close you are probably OK. If you have a high humidity condition I reccomend a refrigerated type dryer. I have one of the Horrible
Freight ones and like it. I think they are around 3 bills now. I run a 1250 on my table also.
I like to put a piece of blotter type paper under my nozzle after the machine has sat for a couple of days then turn the amp knob down till the air starts to come out of the tip and let it run for a minute. The paper will tell you if you have any moisture and letting it run gets rid of any possible condensate in the lines or torch.