Hi as ive got the system 4 enclosed from roy i can add it is very well built i had it build and running in half a dat took a bit of soldering but was pretty simple, just email roy and he is very helpful and quick at replying, onli sujestions is to get a higher voltage to speed up the rapids, but i find 1500mm a minute ample. Ive had it milling aluminium and steel! Hope this helps.