Tried it on 3mm sheet and much better...








Both at 35A and 1500mm/min, the dross is easily knocked off, the "good" side of the cut is nice and square and within 0.1mm of dimension too.


It seems it just does not like thin steel??


I have some 1/4" scrap somewhere, will try that too, but its looking more promising.

I have a feeling that thin stuff is going to be tougher than thick stuff.