Thanks DSpot - that's exactly the same screen set I'm using
I think I still haven't set something up correctly - and it's probably in DevFus Foam rather than Mach3. I've played around with the offsets etc. in DFF, but it still doesn't behave like I want it to.
I set everything up, bring the wire down until it's just above the foam block, and when I start the run, the wire goes up and a away from the foam instead of down into it.
I suspect it's something simple again - but no matter what I've tried so far, the darn hotwire wants to cut the pattern in fresh air above the foam instead of down into it. It's almost if up is down and down is up - but everything goes the right way when I use the jog arrows on the Mach3 screen.
C'est non tres amusant...